"Jerry Wass" wrote

Hate to disagree. but there are more BYU's in a GALLON of Avgas than in a
GALLON of Mogas. Why?? Avgas weighs more per Gallon...

Most fuel type hydrocarbons have nearly the same BTU's per Lb.

I may have to back up off of that statement, and I'll tell you my (possible)
faulty reasoning.

Generally, the more refined, higher octane fuel will have less BTU content.

I "forgot" to take into account that the primary way that 100LL gets its
high octane rating is by the use of lead. That throws things off a little
bit.
--
Jim in NC