Quote:
Originally Posted by Drifter
It's about a 3.5% difference, which is the difference in energy content. Most people see larger than 3.5% variance from one tank to the next, so anecdotal reports vary.
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Difference in energy content is much higher, ~30% between E10 and E85 - here in Finland there is no zero ethanol fuel available.
Difference in fuel consumption depends, due to higher octane number of ethanol - if engine management is advanced enough, it can adapt ignition timing and boost pressure to match those qualities.
Watching only mpg numbers, it looks like gasoline is way to go, but if you care about fossile fuels burnt and carbon emissions, it's a different story.