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Plug readings and experience. With racecars running straight alk jetting was always richer. We would urn almost 3x fuel with alk. So rich it would get past the rigs and fill the oil sump and needed draining every night.
We've had ethanol in gas here since '06. It ate up the fibreglass gas tanks in my boat. I replaced them with polyethylene tanks. I had to take the top end of the motor (350 chevy) apart to clean the gook out of the heads and intake manifold. Have not experienced any issues with any other gas powered machines.No EO fuel around here to my knowledge, except for the Sunoco station in Preston that sells 102 octane racing fuel...Larry
We are discussing pump gas not straight methanol used for racing...E10 is 10 percent ethanol not 100 percent...The difference in energy content is about 4 percent between E10 and E0.There are other factors like specific gravity and additives that may have an effect...From actual experience about one main jet size and on some ,but not all.. the part throttle and idle mixture may need slight changes...
Quote from: Antietam Classic Cycle on July 14, 2018, 11:45:24 AM My Convert actually runs worse and gas mileage drops when I run E0.
My Convert actually runs
Did you rejet for E10? If so you went richer because alcohol is ann oxygenate which leans the mixture. Put in E0 and now you are really rich.
Rough, the alk content is different but the principle is the same. Less energy content so you need more fuel for the same output.