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intr.v. hy·per·miled, hy·per·mil·ing, hy·per·miles
To engage in driving practices, such as shifting the transmission to neutral when going down hills, in order to produce the greatest gas mileage possible.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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If you drive a hybrid vehicle, you're probably already familiar with hypermiling (or "to hypermile"), which is an "attempt to maximize gas mileage by making fuel-conserving adjustments to one's car and one's driving techniques." Some of these adjustments seem logical, like driving the speed limit and maintaining proper tire pressure, but others are a bit more "eccentric" (the editors' word, not mine), such as driving without shoes so that you increase the foot's sensitivity on the accelerator, and parking so that you don't have to back up to exit the space.
She admits she hypermiles in her hybrid Honda Civic.