[ hahy-per-mahyl ]
/ ˈhaɪ pərˌmaɪl /

verb (used without object), hy·per·miled, hy·per·mil·ing

to improve fuel mileage in a motor vehicle, as by adopting certain driving techniques or making design alterations to the vehicle.

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. 2019