Originally Posted by cgaengineer
This is an engine designed to run on either fuel and would naturally have ways to ret@ard timing when using straight gas to prevent preignition. Engine is tuned to generally run e85.
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These results are from a stock 2005 Dodge Ram with 4.7L Magnum. Test was also done on three other vehicles with similar results but I didnt want to copy and paste a bunch of the same stuff(I can if you want). Final conclusion was less BTU's per horsepower are needed with higher ethanol but more fuel was burned droping MPG. This was a HP and MPG study.