Jerry Wass wrote:

I agree that a gallon of Mogas has more btu's than a gallon of Avgas


The main reason being--1 gal mogas= 7.422 lbs.
1 gal avgas= 6.978 lbs.

Q.E.D.
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Not true, Jerry.

Ready Reference Files

Weight of One Gallon (U.S.) of Water, Gasoline, and Ethanol

1 gallon of water equals 8.33 lbs.
1 gallon of gasoline equals 5.8 to 6.5 lbs.
1 gallon of ethanol equals 6.59 lbs.

Source: U.S. Dept. of Energy. Fuel From Farms: a Guide to Small Scale
Ethanol Production. May 1980. Page D-3.

Verified by: JT, 9/98

Disclaimer:
While the Library has verified the information presented in these
files in what it considers to be reliable and authoritative sources,
it cannot take responsibility for nor guarantee the accuracy of the
information presented.

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Avgas
From Wikipedia, the free encyclopedia

Properties
Avgas has a density of 6.02 lb/US gallon at 15 °C, or 0.72 kg/l, and
this density is commonly used for weight and balance computation.
Density increases to 6.40 lb/US gallon at -40 °C, and decreases by
about 0.5% per 5 °C increase in temperature.[3]