I like to go a step further, and figure out how many "free miles" hypermiling got me. In your case: 15,706-((29/38.08)*15,706) = 3,745 miles!
Yeah, that ought to be the measure for non-'milers. Look, I drove from "x" to "y" "z" times for free last year! Are you interested to know how?
Let them simmer in envy for a few minutes, then unleash the fury of mathematics!
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