I've just found an incredible device that can not only increase your mileage but also reduce your chance of an accident. And it won't cost you an extra penny.

It's your brain.

For the past month, we've been running something we called the MPG Challenge. The idea was simple: We wanted to see if all the stuff that the so-called experts recommend will really work. We found six volunteers who were willing to change the way they drive for four weeks.

"Since inception, Xterra has represented an authentic expression of adventure-focused design, both in aesthetic appeal and real-world functionality. With the enhancements for 2009, Xterra is even more in tune with the needs and desires of its active sports enthusiast owners."

Nissan's rugged SUV has undergone several tests including the recent off-road comparison test by Car and Driver magazine.

The newly-introduced Nissan Xterra is receiving numerous positive ratings for its performance.

The Nissan Xterra has come out tops in the gruelling off-road test by the authoritative US motoring magazine. It was rated first among four other competitive vehicles in a rough trail with a 'Category Four rating'.

The vehicle that tops the list could make Tiger Woods blush. The Buick Rendezvous -- Woods is a spokesman for the vehicle -- is ranked as the least safe vehicle available in the U.S. Its followed by other SUVs including Ford Escape, Mercury Mariner, Jeep Liberty and Nissan Xterra.

Want to stay safe as you navigate the open --or congested -- road? You may want to avoid certain vehicles.

Some cars are considered unsafe because of a lack of safety features, others because young, risky drivers seem to gravitate toward them.

Among light trucks, sales of the Murano fell 38.5 percent to 4,199, while Xterra sales fell 32.8 percent to 3,911 and Pathfinder sales dropped 19.5 percent to 4,813.

NASHVILLE, Tenn. - Nissan North America Inc. said Thursday its December U.S. sales fell on a drop in demand for light trucks.

Nissan (nasdaq: NSANY - news - people ) sold a total of 89,555 vehicles in December, down 2.4 percent from 91,775 sold in the same month of 2006.

Sales of light trucks tumbled 5.3 percent to 36,937 from 39,001, while car sales edged down 0.3 percent to 52,618 from 52,774.

"This year, the crossover takes a stand"
By Editors of Motor Trend

A truck in a tux? Not any more. The sport/utility vehicle cuts a broad swathe through the 21st-century automotive landscape. Think of a car genre-sporty, family, budget, luxury, utilitarian, gas-miser -- and you'll find its equivalent in today's sport/utility segment. What once was the territory of a handful of off-road specialists is now a lucrative business for everyone from Jeep to Porsche, Kia to Cadillac, offering everything from gutsy rock-crawlers to fuel-sipping hybrids.