Here's the official definition. I don't really like the extremism notes in the definition, but that was to be expected as the word is starting with hyper. I would have concealed the word to driving techniques, but that's just me.
“Hypermiling” or “to hypermile” is to attempt to maximize gas mileage by making fuel-conserving adjustments to one’s car and one’s driving techniques. Rather than aiming for good mileage or even great mileage, hypermilers seek to push their gas tanks to the limit and achieve hypermileage, exceeding EPA ratings for miles per gallon.
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