Frankly, standardization is often the only option given the limits of a universal technology standard. 1  1. Standardization lag: It takes time to understand a problem domain well enough to make a proper standard.
A flexible-fuel vehicle (FFV) or dual-fuel vehicle (colloquially called a flex-fuel vehicle) is an alternative fuel vehicle with an internal combustion engine designed to run on more than one fuel, usually gasoline blended with either ethanol or methanol fuel, and both fuels are stored in the same common tank.
Some flex fuel versions of engines are optional at extra cost, but it's the same charge as for the conventional gas version of the same engine. The Ford F-150 pickup is an example. Its base price is $18,220, but that's with a 202-horsepower 4.2-liter V6 engine, which runs only on conventional gasoline.