Quote:
Originally Posted by Phantom
I read a while ago that blends between 20E-45E could actually give better MPG but the amounts differed on different cars.
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It differs A LOT by car. My Buick was unaffected up to about 40% ethanol. At the time e85 was about 50% cheaper than e10 so it was a no brainer.
My cobalt looses about 2-4mpg on e40 which ends up not being worthwhile given the $.80 price difference.
I have not done as much testing on the cobalt as the buick. My Dodge also looses a bit of mileage above 30% 2-3mpg (which is huge going from 18-21 to 14-16). My Dodge has in the past gotten nearly the same but I think it was only about a 20% ethanol mix I was messing with back then. Another nice side effect was gaining massively more FE than I lost on the first tank I filled with normal gas, though it did miss a bit I was happy with 22mpg.
Its worth noting that you really don't have to blend your own fuel per seh.
The local ethanol gas station sells E10, E20 and E85. Just add a little of e10 and a little E85 to get what you want.