From: black.hole.4.spam{at}gmail.com (Don Hills)

In article , "Geo"
 wrote:
>
>I understand the theory, yet gasohol gives 20% less miles per gallon than
>straight gas and it's got the same or higher octane rating.

Alcohol has a high octane rating. Trouble is, you need about 2.2 times as
much alcohol per "cylinder full" compared with gasoline. So if
you replace 10% of your gasoline with alcohol, your mileage will drop 5%
(in theory).

On the face of it, it doesn't make sense - by adding 10% alcohol, you
should save 10% gas. But because you are using 20% more of the composite
fuel, you are overall using 8% more gasoline than if it were uncut. So I
question the accuracy of your 20% worse figure. Is that just your car, or
is it a statistic properly derived from a large sample?

--
Don Hills    (dmhills at attglobaldotnet)     Wellington, New Zealand
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