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Ethanol has 65% of the btu's per gallon as neet gasoline.
MtBE has 81% of the btu's.
You can calculate the power loss at any given percentage.
10% Ethanol gets you 96.5% of the power and MtBE gets you 98.1 % of the power of neet gasoline.
The added oxygen molecules in the the MtBE and the Ethanol will help some fatter(richer) running engines run a little cleaner(more complete combustion) and perhaps even generate a little better mpg. But a late model, properly set up engine will get slightly less mpg, slightly less power and virtually no improvement in emissions. The power and mpg issues vary with car make(engine) and state of tune.
DEWFPO
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1998 S90 068,300 and 1995 964 152,300
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