Pedal to the metal or Slow to go? Save 35% on your gas bill.

If you want a big gain in fuel mileage, though, you need to seriously lay off the pedals when driving around town. Accelerating more slowly away from green lights and stopping more gradually for red lights cut fuel consumption in Edmunds.com's tests by 35.4 percent for the Land Rover and 27.1 percent for the Mustang.