Theoretically there should be a 3% loss of MPG when going from gasoline to 10% ethanol. I have recorded every tankful MPG for 115,000 miles. A few yrs ago our rural was required to add 10% ethanol (to buy corn belt votes), so I have 70,000 of MPG with real gasoline and 65,000 miles with 10% ethanol. ( Same driver, same driving pattern, modern state -of -art fuel inj 5.6L Nissan V8). By inspection (have not mathmatically averaged data) it looks like a change from 16.8 MPG to 15.2 MPG, or about >10% loss due to ethanol. Is there a reason why 10%ethanol would reduce MPG by more than 3% ?
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