Fuel Saving Tips
50/50 Rule (part II) As the television show Mythbusters has proven—when traveling under 50 MPH it is more fuel-efficient to leave your windows down and your AC off. When traveling over 50 MPH it is more fuel-efficient to have your AC on and your Windows up. Actually, to enhace this tip, at over 50 mph, keep the windows up AND the A/C off, (if you can weather it). Oh yeah, and keep the speed below 60 mph (sub-2.5K rpm). Combined, you should realize a +5 mpg.
posted by TMACK on August 1, 2009
this tip works for 55% of voting Fuelly members.