This metric is a way to compare gas-powered oranges with electric apples, and other fruit you wouldn't want to eat.

Miles per gallon (MPG) is well-established as the standard measure of fuel economy. It's so well established, in fact, that few of us question the MPG rating on a daily basis — at least until we ...

Aircraft weight: Higher takeoff weights, whether from full passenger loads, cargo, or fuel for long stages, increase fuel ...