Viewing the statistics, it’s easy to understand how the Insight hybrid achieved those remarkable gas mileage results. Weighing in at under a ton, Honda’s little spaceship had a big head start, with a diminutive 1.0 liter three cylinder engine providing just enough oomph and efficiency to land the micro hybrid’s gas mileage in the stratosphere.

With the Insight put out to pasture after the 2006 model year, the Toyota Prius snatched the hybrid gas mileage crown, edging out the Honda Civic Hybrid.

The mid-decade loss of the Civic Hybrid’s manual transmission option is worth noting. With the ever-increasing focus on fuel-efficiency and a Honda sports hybrid on the way, it might not be the last we see of the stick-shift Honda hybrids.

The promise of the 100 mile per gallon (MPG) hybrid isn’t a dream … it’s achievable today, with an aftermarket plug-in hybrid conversion kit.

2000-2008 Hybrid Gas Mileage

The 2008 Mariner Hybrid is equipped with a 2.3 liter four-cylinder engine producing 133 horsepower (HP) and 124 foot pounds of torque, along with an electric motor that cranks out 94 HP (for a stated 155 HP combined). Non-hybrid Mariners are available with the owner’s choice of a 2.3 liter four-cylinder engine that produces 153 HP and 152 foot pounds of torque or a 3.0 liter V-6 that provides 200 HP and 193 foot pounds of torque.

Mercury Mariner Gas Mileage – 2005-2008

Note: the EPA tweaked their testing procedure, starting with the 2008 model year, with the end result being that the 2008 MPG estimates are now lower than previous years. As always, YMMV.

Simply put, the aerodynamics and vehicle weight of the bulkiest SUVs cause gas mileage to suffer, leading to many a painful transaction at the pump. The trick is to get small(er), lighter, and more slippery. Credit Subaru for getting the ball rolling with popularizing economical 4WD drive passenger cars in the early days. Since 1997, every vehicle Subaru’s offered in America has been all wheel drive.

These days, it’s not just Subaru. There are plenty of four wheel drive choices that are neither truck nor SUV. And forget the notion of pint-sized economy cars. You’ll find a generous helping of 4WD luxury from manufacturers including Audi, Volvo, Cadillac, and Lexus … in fact, you’ll find many of their offerings in the 2008 list of best gas mileage four wheel drives.

Purists will gladly share that there’s a difference between four wheel drive and all wheel drive (AWD). And surely there is … but for a great many folks, it comes down to two simple questions: will it go in the snow and will I go broke feeding it?

At the other end of the spectrum, the little Suzuki SX4 delivers plenty of bang for the buck, by combining the best four wheel drive gas mileage with a low sticker price (for those who don’t just think miles per gallon … but miles per dollar.)

Along with its corporate cousins, the Ford Escape Hybrid proves the exception to the rule as the highest all around mile per gallon (MPG) four wheel drive vehicle. If you can’t get a great deal on an Escape Hybrid at your local Ford dealer, take a look at the Mercury Mariner Hybrid. And if you happen to live in Southern California, the Mazda Tribute Hybrid HEV might be an option … as long as you’re able to snag one of the 350 Tribute HEVs built for this test market.)

2008 Best Gas Mileage Four Wheel Drives

• Audi A4
• Suzuki SX4
• Subaru Legacy
• Subaru Impreza
• Subaru Outback
• Jeep Compass
• Ford Escape Hybrid
• Jeep Patriot
• Subaru Forester
• Mazda Tribute Hybrid
• Mercury Mariner Hybrid
• Honda CR-V
• Volvo S60
• Volvo V50
• Volvo S40
• Toyota RAV4
• Cadillac CTS
• Cadillac STS
• Lexus IS 250
• Nissan Rogue