Originally Posted by Mystikal
Read the pumps at each station for ethanol content. You'll begin understanding there.
Natural Resources Canada link:
"What effect does using ethanol fuels have on fuel consumption?
While a 10 percent ethanol blend contains about 97 percent of the energy of "pure" gasoline, the energy loss is partly offset by the increased combustion efficiency of the engine. This could increase fuel consumption by about 2-3 percent"
So, for the average car, it'll be a 0.2 to 0.3l/100km consumption increase but cleaner exhaust. I don't think that's a big difference. Driving pattern and habit have a much larger effect.
Ok, so Shell is the only one that doesn't use ethanol?