With a major power and size overhaul coming for 2010, the 2009 Toyota Prius keeps its footprint unchanged, with the exception of the possible addition of roof solar panels late in the model year. The world's best-known hybrid sedan continues to excel in fuel economy. With official numbers around 48/45 mpg and consumer reports of anywhere up to 50 mpg, the Prius reigns as the most fuel-efficient vehicle on the road.

Available in Standard, Base, and sporty Touring trims, the front-wheel-drive 2009 Prius offers a full hybrid system, meaning the car can run on either the engine or the electric motor alone (the latter only when traveling at speeds of 25 mph or less), or a combination of the two. Combined, the 1.5-liter DOHC inline-four engine and two electric motors put out 110 hp. No plug-in is required. The only transmission is an ECVT, or electronic continuously variable transmission, which reduces gear grind and shift noise to deliver a smooth and quiet ride. Highway acceleration can unfortunately feel sluggish, but no one buys the Prius to break land-speed records. Regenerative braking and engine cut-off when idling recharge the NiMH battery.

The 2009 Prius boasts a surprisingly roomy interior, with more rear legroom than a Ford Crown Victoria. Its 38.6 inches of legroom easily accommodate two adults in the back, though the sloping roofline can feel cramped for anyone 6 feet or taller. Rear seats split-fold conveniently flat, and the 14.4-cubic-foot trunk features underfloor storage for extra capacity. In the front, an LCD screen displays hybrid information and incorporates both climate and audio controls. The screen can be a bit distracting and overly complicated at first use.

The Standard trim offers full power accessories, Bluetooth, a CD/MP3 player, and keyless start. The Base adds cruise control, heated mirrors, and a rear spoiler. The Touring replaces the 15-inch wheels with 16-inch alloys and adds foglights, xenon headlamps, and a sport suspension. Plenty of upscale options are available, but they can really drive up the already high price of the 2009 Prius. Various packages offers voice-activated navigation, a Smart Key, a rearview camera, and leather upholstery. All trims earn four stars in crash tests and come equipped with 4-wheel ABS brakes, traction control, and dual front-side and side curtain airbags for both rows. Stability control is optional on the Standard and standard on Base and Touring trims.

Any complaints about the 2009 Prius become quickly overshadowed by its overwhelming fuel efficiency. A roomy interior, easy maneuverability, quiet handling, and tight turning radius contribute to an overall comfortable and smooth ride. Drivers and critics do complain about the flat, hard, and uncomfortable front seat cushions, the lack of telescopic steering, and the poor rear visibility caused by the small rear window. A desire for more power should be answered by the upcoming 2010 Prius, which will replace the 1.5-liter with a 1.8-liter inline four, supposedly without sacrificing fuel economy.