Ideas Needed: Why sudden drop in mpg?
I always seem to average right around 8.5 mpg however the return leg of this last trip I saw averages around 7.5 and that concerned me. I'm looking for reasons this could have happened. 1) The ret...
Forum Discussion
philand wrote:427435 wrote:If you read the referenced information, The CGE of ethanol(i00 %) Is slightly less than half of the energy of std. gasoline. The octane is higher allowing higher compression without detonation.philand wrote:copeland343 wrote:Ethanol has only 1/2 the btu as gasoline, so 10% ethanol will give you 5% mileage penalty. I used to travel w/ guys who raced outboards. We used 100% ethanol and had to rejet carbs. BTW, I think the farmers brought us ethanol along with a guy who owned a big distillery. I don't think even the tree hungers could come up with a more destructive idea.
ethanol
That's wrong. Ethanol has 2/3 of the BTU's of gasoline.
http://en.wikipedia.org/wiki/Gasoline_gallon_equivalent
Look again. Pure ethanol has 66.67% of the BTU's of base gasoline------or it takes 1.5 gallons of pure ethanol to provide the same BTU's of a gallon of pure gasoline.
Thus, a gallon of fuel that is 90% gasoline and 10% ethanol will have 96.67% of the BTU's of a gallon of pure gasoline.
