C. E. White wrote:
> "Gill" > wrote in message
> . ..
>
>> I do however see a two mile per gallon decrease when using the now,
>> "required by law in Oregon" E10. ****es me off!
>
> Are you really seeing a 2 mpg decrease when using E10? Ethanol has
> about 85% as much energy as gasoline, so I would guess E10 has about
> 98.5% as much energy as plain old gas. Assuming the gas suppliers are
> keeping the octane the same (i.e., using the octane improvement
> related to ethanol to use lower octane gasoline for the other 90% of
> the blend), I would guess your mileage should only decrease by 4% at
> the most. A 2 mpg decrease on 25 mpg is an 8% decrease. This seems
> like an unreasonably high decrease for a modern fuel injected vehicle.
> Of course if you have an older carbureted vehicle, then the use of E10
> screws up everything and a larger decrease is certainly possible (and
> even likely).
>
> Ed
>
>

My 97 Ranger was getting between 17-18mpg and now is around 16, so maybe
not quite 2mpg.
Could be winter oxygenated fuel too, I don't know?

--
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