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verb (used without object), hy·per·miled, hy·per·mil·ing
  1. to improve fuel mileage in a motor vehicle, as by adopting certain driving techniques or making design alterations to the vehicle.
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Origin of hypermile

First recorded in 2006; hyper- + mile
Related formshy·per·mil·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018