With a name like "Ethos," this really sounds like someone is just selling Ethanol for you to put in your gas tank. Some engines can run fine on ethanol, whether mileage actually improves is under debate; obviously if its debatable, its probly not a worthwhile difference. However what ethanol can certainly do in higher concentrations is eat through your seals and hoses. Unless engines are specifically designed to run on high concentrations of ethanol, you're only chancing premature major engine failure. Some vehicles are considered "FlexFuel" or "E85 Compatible" and can take the Ethanol fuel mixes which are predominantly available in the mid-west. Ford has a number of Flex vehicles and GM's gas trucks can be ordered with an E85 compatible engine. I read about the modified GM trucks and the only difference is a beefed up fuel system to handle the different fuel; without it different parts of the fuel system will corrode or fail over time.
Read these links for a start on what you're looking at before you start dumping this into your tank:
http://en.wikipedia.org/wiki/Alcohol_fuel
http://www.ve85.com/FAQ/
I keep forgetting you're out in CA. You've been using a 10% ethanol gas mix for forever; a long time ago California declared the additive MTBE cancerous and eliminated its usage. They're doing the same thing everywhere else now, but previously other areas only got ethanol mix in the winter; something about the alcohol aborbing water so it doesn't sit on the bottom of your gas tank and freeze I think, referred to as oxygenated gas. cars generally run worse on "winter" gas, losing horsepower and mileage.
Do yourself a favor and just buy an E85 compatible vehicle. What kind of car are you driving now anyway?
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