The 2010 Nissan Altima line includes sedans and coupes, four-cylinder, V6, and a gas/electric Hybrid.With sharp handling, the Altima represents a sportier alternative to other midsize cars such as the Honda Accord, Toyota Camry, and Ford Fusion.

The standard four-cylinder engine delivers more-than-ample power with good fuel economy.It is rated at 175 horsepower and 180 pound-feet of torque (170 and 175, respectively, in California).The available V6, closely related to the engine in Nissan's 370Z sports car, delivers exciting performance, with 270 horsepower and 258 pound-feet of torque.

The gas-electric Altima Hybrid Sedan boasts an EPA-rated 35 miles per gallon City, extending its range past 600 miles between fill-ups.The Hybrid features a less powerful version of the four-cylinder (158 horsepower) and an electric hybrid drive.Its electrically powered air conditioning works even when the engine is stopped.

Altima Sedan models are equipped with a continuously variable transmission, or CVT, which works like an automatic.Nissan has excelled at CVT technology.The Coupe is also available with a six-speed manual transmission.

2010 brings significant changes.2010 Nissan Altima Coupe and Sedan feature new exterior styling.The 2010 Altima models get upgraded interior treatments with more technology and entertainment features.Changes for 2010 Altima models include an advanced Nissan Hard Drive Navigation System with a 9.3GB Music Box for digital music storage and playback with a standard 6.5-inch color touch-screen display.All 2010 Nissan Altima models come standard with Vehicle Dynamic Control electronic stability control, which includes the functions of anti-lock brakes (ABS) and Traction Control, now standard on all models.

The Altima Sedan is comfortable, practical and well suited to growing families.It gives up little rear-seat room to the larger Nissan Maxima, with plenty of room in the trunk for luggage and cargo.In both the Sedan and Coupe, the Altima's cargo space can be expanded into the cabin, thanks to a standard fold-down, locking rear seatback.

The Altima Coupe two-door looks sportier than the Sedan.It sacrifices a substantial amount of rear seat room and we'd say it's a car for two people.

The Altima model line fits a wide range of tastes and budgets.The base sedan begins with the essentials, while the generous list of options, most grouped into packages, allows equipping the Altima at luxury-class levels.

Nissan Altima models get high marks for safety; standard equipment includes a full complement of airbags, anti-lock brakes, Nissan's Vehicle Dynamic Control (VDC) and Traction Control.A rearview camera is optional.

Drivers who put an emphasis on value for the money will find the Nissan Altima worth a look.

The 2010 Altima Coupe and Sedan feature new interior enhancements.There are new fabrics for both Sedan and Coupe, and a revised Blonde interior color.In the Coupe, the gauge appearance has been changed and incorporates white illumination.The biggest interior change is the availability of the new premium audio upgrade, which includes a 4.3-inch color display, Bluetooth Hands-free Phone System, USB port with iPod connectivity, XM Satellite Radio, a RearView Monitor.and other features.

The overall level of fit, finish and refinement inside the Altima is very good and highly competitive in the class.The available leather upholstery feels rich, and soft materials are used for touches like padded armrests.

The Intelligent Key allows the car to be started with the key in your purse or pocket.When the key is close enough to the car, the driver starts it by pressing a red button to the right of the steering wheel.Many owners find these systems convenient, but you can wind up with a dead battery if you inadvertently press the start button two times instead of once to shut down the car.That leaves the system in the accessories mode, and it can eventually drain the juice.We prefer traditional keys.

The front seats in the Altima sedan are relatively large.They feel firm and supportive.They also have optional power lumbar support and elevate substantially, allowing a better view between all the SUVs on the road.The seats in the Coupe are unique, with more aggressive bolsters befitting this model's sporty aspirations.

Beyond the seats, the dashboard is functional without being boring, and stylish without being frilly.We like the layout.The steering wheel has an original, artistic design.The gauges are arranged in a practical shape, with speedometer in the center, tachometer on the left, and fuel gauge and water temperature on the right.The lettering is sharp and easy to read.LCD insets display trip information, outside temperature, safety-related data and personalized settings.

The center stack is neatly designed, with three big HVAC (heating, ventilation, air conditioning) knobs at the bottom.They're easy to understand and operate.Controls for the base and up-level audio systems sit just above the heater knobs, and they're friendly to the eye and fingers.The base audio system is satisfactory.The nine-speaker Bose upgrade sounds particularly rich.

The shift lever occupies the forward portion of the center console separating the front bucket seats.Altimas with the continuously variable transmission have a foot-operated parking brake, but the gear selector is slightly awkward for using the manual shift feature.Cars with a manual transmission have a handbrake next to the shifter.Even when it's not engaged, the handbrake sits up at just about the right height to trip the bottom of a coffee cup as it's lifted out of one of the cup holders situated between the shift lever and the bi-level center storage bin.

The primary storage space inside the Altima is the glovebox.It's huge, and it locks, so you can store a laptop computer in there.There's also a storage bin with a hinged cover at the bottom of the center stack.The problem is that the only power point accessible for plugging in a radar detector is tucked deep inside this bin.The fixed pockets in each front door are too small for maps, but they have molds that fit half-liter water bottles.That's nice, because tall, thin bottles are too small for the center console holders, where they flop this way and that through the mildest maneuvers.There are two more cup holders in the rear seat.

The Altima Sedan's rear seat is roomy enough for two good-sized adults traveling to dinner or the movies, though we're not sure about a cross-country trek.The center seat is best left to age 12 or less.Access to the rear seat is easy, in the Sedan.

As would be expected, the Coupe is a slightly different story.Its front-passenger seatback has a release lever on the inboard side that allows the driver to ease passenger access to the rear seat.That access isn't particularly awkward, because the lever folds the seatback and slides the entire front-passenger seat forward in its track.The only problem is that the front seat forgets its settings, returning to a pre-set, default position in its track and seatback angle.

Once a passenger is settled in the Coupe's back seat, the change in exterior dimensions is obvious.Most of the Coupe's four-inch reduction in wheelbase translates to a decrease in rear-seat legroom, and this isn't a place most adults will want to spend more than 20 or 30 minutes.The Altima Coupe is a coupe, to be sure, and tighter rear-seat space is to be expected.Still, it seems tighter in the Altima than in the Honda Accord Coupe.

In trunk room, the Altima Sedan is competitive in its class, with 15.3 cubic feet of space.Thanks to a relatively short trunk lid, though, a lot of that space stretches forward under the rear parcel shelf.The Altima Coupe isn't really in the game, with only 8.2 cubic feet of truck space.

In the grand scheme, Honda's Accords are a bit better balanced than the Altimas, with an outstanding mix of ride quality, good handling and smoothness.Toyota's Camry sedan is more refined still, and even more comfortable.Yet Nissan has managed to give the Altima an edge in performance and driving feel that might please car enthusiasts.

The 3.5-liter V6 is the preferred engine for drivers who measure a car's desirability by how quickly it gets away from a stoplight, or how readily it might attract the attention of cars with flashing red lights.The V6 makes a potent 270 horsepower, and it's a very close relative of the 3.7-liter V6 in the Nissan 370Z sports car.There's more than enough scoot here, and it's awesome for passing.The 6600-rpm redline is a blast.The V6 also delivers 258 pound-feet of torque, which is very useful with the optional CVT automatic transmission.

The four-cylinder engine may be the more prudent choice, given the reality check of today's gas prices.The Altima's four-cylinder engine delivers competent performance, so there's less reason to pay more now at the dealer and more later at the gas pump.The Altima 2.5 S models we drove had plenty of power, from our perspective.Modern and refined for a large four-cylinder, Nissan's 2.5-liter engine delivers 175 horsepower and 180 pound-feet of torque.

Of the two transmissions, the six-speed manual, available only with the Coupe, is the choice for fun driving.This manual is relaxed and manageable, and, quite frankly, a better transmission in terms of sharp, precise gear selection and tight shift patterns than those in some more expensive European sports sedans.

The CVT, or continuously variable transmission, works like an automatic and is intended to improve fuel mileage compared to a conventional, stepped-gear automatic.Regardless, EPA ratings only barely surpass those for gas-only Altimas with the manual transmission: 23/31 mpg City/Highway with the four-cylinder and manual, and 23/32 with the four-cylinder and CVT.The V6 is rated at 19/26 mpg (premium fuel required).

The sophisticated electronic system that manages the CVT attempts to keep the engine turning at an optimum speed that balances power output, fuel economy, and emissions.In doing so, the transmission can make the engine sound a bit noisy, or just funny, particularly with the four-cylinder.In full automatic mode, the CVT can seem lazy and ill at ease, leaving the engine wandering about its power curves and often sounding as if it's straining, even if it isn't – and most of the time it isn't.

For enthusiast driving, we found the CVT works better when it's shifted manually, changing its ratios in steps like a conventional transmission.Using the shift lever, this transmission responds quickly and consistently to the driver's commands.When we used it in the real world, shifting the Altima like a 370Z on the road from the Golden Gate Bridge northward to Stinson Beach, the CVT was beautiful.Downshifting to slow down worked well, complementing the brakes when rushing toward those downhill curves.

In general, the Altimas have a distinct fun-to-drive character.The chassis feels tight, and there is a minimum of noise and vibration passed on to the occupants.Powertrain sounds aren't intrusive, except for some roaming whine as the CVT wanders through its infinite ratios.There's little wind noise, though the thump from tires may keep Altima occupants well informed of pavement quality.

The suspension delivers responsive handling.There's little or no swaying in switchback turns, so the steering stays true.Yet it isn't harsh over jagged parts of the road, and it takes some good punches from potholes without flinching.

Steering is respectably responsive in all Altimas, if not especially crisp, with competent turn-in and feedback through the steering wheel.Torque steer (a tendency for the steering wheel to jerk to-and-fro under hard acceleration) is well managed in all models, and that's saying something with the 270-hp V6.

The Altima Coupe drives like a well-tuned front-wheel-drive car.Like the Sedan, it has a major front-end weight bias, ranging from 60/40 front/rear in the four-cylinder manual to 63/37 front/rear in the V6 CVT.But its well-tuned tuned suspension does a good job of compensating.Coupe buyers shouldn't expect pure sports car handling, though.When pushed, the Coupe's dominant characteristic is nice, safe understeer (where the car wants to go straight instead of turning), which intuitively encourages the driver to ease up on the gas pedal.

The brakes are vented discs in front and solid discs in the rear.All Altimas come with four-channel, four-sensor ABS with Electronic Brake-force Distribution (EBD), which optimizes the front/rear brake balance depending on load condition (passengers and cargo).A variable-ratio-pivot brake pedal provides a rigid feel at freeway speeds and less sensitive, more controllable operation in city driving.

When fuel economy is the priority, the Altima Hybrid Sedan is the choice.Just remember that it will take years and years of driving to make up the $5,000-$7,000 price premium in reduced gasoline costs, compared to a conventional four-cylinder Altima.The Hybrid is EPA-rated at 35/33 mpg.

The Hybrid uses a somewhat de-tuned version of the 2.5-liter four-cylinder, rated at 158 horsepower and 162 pound-feet of torque at 2800-4800.Mounted in tandem, its AC synchronous motor-generator can produce up to 40 horsepower and 199 pound-feet, both at 0-1500 rpm.Potentially, that totals a substantial 198 horsepower and 261 pound-feet of torque.

Such high torque at low rpm allows the Altima Hybrid to start from a dead stop using only the electric motor to accelerate.So, precisely where a conventional internal combustion vehicle is operating at minimal efficiency, the Altima Hybrid isn't using any gasoline at all.After the electric motor provides initial acceleration, the gasoline engine quietly starts and shoulders most of the load.Eventually the electric motor shuts off, and the gasoline engine does what it does best, which is constant-speed cruising.Then, when required, the electric motor restarts to give the gas engine some help in, say, a passing situation.It all works seamlessly, though it takes a fairly light foot on the accelerator to maximize the Altima Hybrid's operation in electric mode.Drivers who routinely mash that gas in most circumstances aren't likely to see the maximum improvement in mileage.

In the Hybrid, the CVT works with the master control system to determine which power source or combination of power sources will turn the wheels.The Hybrid uses regenerative braking to recharge its 245-volt nickel-metal hydride battery, turning the electric motor into a generator as the car slows down.You never have to plug it in.

The Nissan Altima 2.5 Sedan ($19,900) comes with cloth upholstery, air conditioning with cabin air filter, power mirrors, power door locks, power windows, and remote keyless entry.It comes standard with the CVT.The Altima 2.5 S Sedan ($21,840) adds a six-speaker stereo with single CD and offers a greatly expanded options list.

The Altima 3.5 SR Sedan ($24,520) adds the 3.5-liter V6 engine with CVT, a leather-wrapped steering wheel with audio and cruise controls, 17-inch alloy wheels, automatic headlamps, eight-way power driver's seat, heated side mirrors with integrated turn signals, and remote keyless entry.

The Altima Coupe 2.5 S comes standard with the four-cylinder engine and manual transmission ($22,440) or CVT ($22,940).The Coupe 3.5 SR features the V6 and a choice of manual ($29,600) or CVT ($27,270).

The Altima Hybrid ($26,780) is available only as a sedan and only with the CVT.It comes with cloth upholstery and mid-grade features.

Options include a 2.5 S Convenience Package for sedan ($1,100) and coupe ($1,070) with eight-way power driver's seat, automatic headlights, leather-wrapped steering wheel, dual illuminated visor vanity mirrors, auto up/down passenger's window, key fob auto windows down, and other items.A Convenience Plus Package ($1,150) adds power moonroof, dual-zone automatic climate control, and side-view mirrors with integrated turn signals.A 2.5 S Premium Audio Package for the sedan ($1,240) adds a Bose audio system with nine speakers, a 4.3-inch color display, Bluetooth hands-free system, iPod connectivity, XM Satellite Radio, and additional audio features.The Sport Package ($2,370) for the 3.5 SR Sedan includes the dual-zone automatic climate control, power moonroof, High Intensity Discharge headlamps, rear spoiler, and fog lamps.The 3.5 SR Premium Package ($2,380) for the 3.5 SR Sedan includes leather seating, heated front seats with power driver's side lumbar support, the Bose audio system, HomeLink universal garage-door opener, compass, mood lighting, rear-passenger air conditioning outlets, and additional trim features.

For the Coupe, the 2.5 S Premium Package ($2,070) includes the dual-zone climate control, moonroof, Bose audio system, and numerous additional items.The Leather Package ($2,060 adds leather seating, the HID headlamps, HomeLink, compass, and other trim features.The 3.5 SR Premium Package includes the dual-zone climate control, Bose audio, RearView monitor, Bluetooth, iPod connectivity, and additional audio enhancements.

The Technology Package ($1,780) includes the Nissan Hard Drive Navigation system with the 6.5-inch color monitor, 9.3GB Music Box hard drive for digital music storage and playback, XM NavTraffic and NavWeather, DVD player, Bluetooth Streaming Audio, steering-wheel system controls, and VTR jack.Stand-alone options include fog lights ($310), interior floor and trunk mats ($175), and a variety of other features and accessories.

Safety features on all models include dual-stage front-impact airbags, front seat-mounted side-impact airbags, front and rear curtain-style airbags for head protection, VDC electronic stability control system with Traction Control, and ABS with Electronic Brake-force Distribution, for optimum braking under a range of conditions.

The 2010 Altima Sedan and Coupe both have new front ends, with new hoods, grilles, and front bumpers.The Sedan also has an enhancement to the rear, with new detailing around the license plate.The Coupe has new projector beam headlamps.The Sedan has new 16-inch and 17-inch alloy wheel designs, and the Coupe has new 17-inch alloys.In both cases the 2010 Altima models have more visual presence, and there is also more differentiation between the Sedan and Coupe.

We like the 2010 styling changes and think the Altima, in both Sedan and Coupe form, appears more refined and upgraded in appearance.

The basic profiles remain.The Sedan's rear deck is distinctively short.Its fender flares are pronounced, allowing the rest of the body to be narrower and slip through the wind with less frontal area.The gap between the tires and flares looks tight, just as we like it.

The headlight and taillight clusters are elaborate, almost exotic.The halogen headlamps are irregular, vertical trapezoids with soft edges, with four bulbs inside for the high beam, low beam, turn signal and parking lights.Nissan calls the headlamp arrangement a multi-parabola, which means its coverage is all over the place.As for the taillights, Nissan says they cost nearly as much as the headlamps, so don't back into anything.They're covered with clear plastic like the headlamps, and contain a silver ray-gun looking cylinder with the red lamp, plus a round white beam for the backup light, and a big orange piece for the parking lamp and turn signal.

The Altima Coupe has the look of a pure sport two-door.There's good balance between the longish hood, greenhouse and short trunk lid, with just the right amount of sheet metal between the cleanly outlined wheel arches.Credit for these proportions goes to a wheelbase (distance between the tires front to rear) shortened by four inches from the sedan, which enabled a shortened overall length.

The Coupe's back end shows a bustle shape that's fed by the arc of the roof flowing toward the trunk lid.This design probably increases stability at socially irresponsible speeds, but at rest it can look almost plump.The rear glass offers decent rearward visibility from the driver's seat.

NewCarTestDrive.com correspondent J.P.Vettraino reported from Detroit, with Sam Moses in San Francisco, Tom Lankard in Minneapolis, and John Katz in Harrisburg, Pennsylvania.