Quote:
Originally Posted by Ken Fry
...As a simple rule of thumb, you can take a steady state condition for 45 mph, going up a 2% grade, and in a minute of two get an MPG figure which is close to the combined EPA figure... for many vehicles.
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This was an interesting insight as well. It is obviously something you or someone you know reverse engineered to obtain, so huge caveats apply, but could be useful in situations that are not too far off the beaten path.