We've been on max (10%) ethanol in MA for quite a while now, and while it has ruined a couple of fuel lines in weed wackers and chain saws, it does not appear to have damaged any of my 300s. It has messed up the SU style carbs in my 72 MG Midget, as well as the sending unit in the gas tank and the electric fuel pump.
There isn't a single station in the state that sells real gasoline.
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I just read in Autoweek mag Jay Leno's essay on the evils of ethanol. In my 300F I have been running a mix of 100+ octane leaded aviation gas and pump premium spiked with the normal amount of ethanol. Has anybody in the Club experienced any problems with today's ethanol-infused gas? Jay talks about rubber parts (in fuel pumps, for example) being eaten up and ensuing engine fires. Terry McTaggart