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.
The 5.3-liter flex fuel V8 gets the same gas mileage as the regular 5.3-liter when using gasoline; however, when using E85, gas mileage drops to 10 miles per gallon in the city and 15 on the highway, according to the EPA.