Try this formula!
April 6, 2012 9:29 AM 
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I was trying to think of a way to get a more meaningful average of consumption to make it easier to track changes and improvements, let me know what you think.
C1 (%city) * C2 (cityMPG) = A
H1 (%hway) * H2 (hwayMPG) = B
A + B / 100 = EC
This formula uses the manufacturer data for consumption, and your own estimates of the city/highway split, this gives an expected consumption (EC). This lets you know how your car is actually performing against the manufacturer's values. The reason I do it this way is because a manufacturer's average is only relevant at exactly 50% city, 50% highway miles. This formula gives you the relevant everage at your current distance and city/highway percentage.
H1 (%hway) * H2 (hwayMPG) = B
A + B / 100 = EC
This formula uses the manufacturer data for consumption, and your own estimates of the city/highway split, this gives an expected consumption (EC). This lets you know how your car is actually performing against the manufacturer's values. The reason I do it this way is because a manufacturer's average is only relevant at exactly 50% city, 50% highway miles. This formula gives you the relevant everage at your current distance and city/highway percentage.
posted by FlexibleMouse to Fuel Talk at 9:29 AM
