does ram air affect economy?

STC (suplement type cert) is an FAA approval to run car gas, depending on the engine model, it's as simple as a few gaskets, seals, and of course a mountain of paperwork.

Avgas, 100LL for instance, is held to a higher standard than car gas, for one, instead of toulene and benzene, avgas has TEL (tetra ethyl lead) added for octane, and believe it or not, is actually more toxic, which is why thye don't run it in cars ANYMORE..... A long time ago, I guess you could get premium fuel called "ethel" or something? That was simply AVgas..... Both are hydrocarbons from petroleum, alkylate, and reformate.....

Race fuel is simply essentially Avgas, if it is TEL, it's been a while, but KLOTZ, which is what we were able to get up here, was TEL based when I was interested in what was in it when I was a kid. The other, and greatest advantage of TEL gasoline, is it is far more stable because it is formulated to run at high altitudes, it is also almost impossible to get to vapor lock in your average race auto. (just like race fuels)

So yeah, he WAS right, it IS different, but, is actually better for a high compression auto engine than typical car gas, but worse for the enviroment.

Sorry to bore you with a total unrelated post about nothing, LOL.

*I ran 100LL for a whole summer in my everyday driver, probably 10K miles, with no issues other than it smells interesting when idling in a 600 lift roller engine*