What in the world is a Flexible Fuel Vehicle? It's a car or truck that is capable of burning certain alternative fuels. Now we're not talking gasoline vs. diesel engines here, we're talking about gasoline engines that can also burn ethanol, natural gas, propane, hydrogen, methanol, and p-series fuels. According to some chemist at the U.S. Department of Energy, p-series fuels are "a unique blend of natural gas liquids (pentanes plus), ethanol, and the biomass-derived co-solvent methyltetrahydrofuran" just in case you were wondering.

Anyway, if you own one of these flexible fuel vehicles, and you could own one without realizing it, then you might be able to save yourself a whopping amount of money now that gas is nearing the price of gold.

Although some of the more exotic alternative fuels may not be flowing out of the pumps at your neighborhood service station, there is a good chance that ethanol is.

Ethanol is alcohol-based and it's made by fermenting and distilling corn, barley, or wheat. It can also be made from "cellulosic biomass", which is just a fancy phrase for "chunks of trees and grass", except that this version is called "Bioethanol" instead of plain "Ethanol".

E85 is an Ethanol/Gasoline product that's being sold at a lot of gas stations. It's a blend of 85% ethanol and 15% gasoline. E95 is a 95/5 blend of ethanol and gasoline. Both blends are capable of being burned by most Flexible Fuel Vehicles.

Some service stations are selling an E10 (10/90 ethanol/gasoline blend), that doesn't really qualify as an alternative fuel. Its primary purpose is to reduce carbon monoxide levels, and it can be burned by most any engine that burns