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How to Build a Greener SUV
Hybrids may be the coolest fuel savers, but gas-gulping SUVs could be a lot more efficient too. The Union of Concerned Scientists has come up with a design that achieves 35% better fuel economy than the best-selling Ford Explorer. For only $760 more, that green SUV could be on the road. Combining the usual body-on-frame design into a lighter "unibody" would boost fuel economy as much as 8%. Add a sixth gear to the transmission, lower-friction lubricants and electronic valve...