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not driving faster then speed limit. Wind resistance is a square of the velocity. 40 MPH is a point where using your AC is more efficient than having windows opened. When driving at highway speed use your cruise control (much more efficent than you foot). Keep tires properly inflated (can gain up to 6% mpg). Accelerate normally and get out of some people way. Getting rear-ended will diminish your efficiency to zero.
posted by 67.75.117...
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