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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Oct 2021 Posts: 6,771 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,771 | Tronman, 100LL is aviation fuel. It's not legal for street use. It has lower volatility and may result in hard starting in a car. It's designed for engines operating at high altitude, i.e. piston engine airplanes.
The octane rating for Avgas is derived using a different formula than automobile gasoline.
The 100 rating is based on the Motors Octane Number (MON), whereas automobile gasoline uses the AKI rating, which is an average of MON + RON (Research Octane NUMBER).
That works out to an AKI octane rating for 100LL of about 108.
100LL is also known as 100/130 octane. The 100 is the octane rating based on lean mixture conditions for cruising and 130 octane at rich mixture conditions at full power.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
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