Originally Posted by Dino@his Dad's
Flex fuel cars use more when running on ethanol, but dedicated ethanol engines do not.
Not true, ethanol or methanol only has about 55 to 60% of the heat energy that is in a gallon for pure gas. Heat energy drives the engine. A pure alchol engine can have higher CR ratio to help it some but it will always use a lot more fuel. Figure on a range of 40 to 70% more fuel usage. (it requires a much richer mixture too in a fuel to air ratio)