Believe it or not most passenger cars won’t run on ethanol unmodified these days. Even running on 50 or 80% ethanol blends usually requires custom ECU maps to

Believe it or not most passenger cars won’t run on ethanol unmodified these days. Even running on 50 or 80% ethanol blends usually requires custom ECU maps to run. Let’s not even talk about all the things in the fuel system that seem to have a shorter life with ethanol involved, particularly injectors.