Flexible Fuel Vehicle

A flexible fuel vehicle is one that can operate on:

(1) alternative fuels (such as M85 or E85)

(2) 100 percent petroleum-based fuels

(3) any mixture of an alternative fuel (or fuels) and a petroleum-based
fuel.

Flexible fuel vehicles have a single fuel system to handle alternative
and petroleum-based fuels.

(Courtesy of Energy Information Administration, U.S. Department of Energy)