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Old 06-07-2008, 11:22 AM   #27
Join Date: Feb 2002
Location: Stance
Posts: 13,107
Originally Posted by europrince View Post
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?
Yeah, that increased combustion efficiency part is BS. That would only occur on a car that is designed to run on 94 (and is therefore cutting back timing to run on 91). I see a lot of government sites claiming this 2-3% business, which makes me skeptical.

That said, ethanol effects debate or not, Shell 91 is the only premium that has none of it.
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