What's the difference between the three different types of gas they have at the pump?

Question

Octane. . . Which means. . . .?

Answer 1

octane level, which means more potent gas. (supposedly)

Answer 2

It means very little if your car doesn't need it.

Say you have a carburetor with float bulbs, it will never need a high octane.

Cars with fuel injected carburetors do, and they tell you what octane they recommend.

It does burn slower or ignites slower, something like that.

Well anyway to keep the injectors clean from the fuel burning on the heads of the injector, it needs more time.

Think of it like a slow burning fuse on a fire cracker.

The slower the fuse burns the more time you have to get away before it explodes.

You don't want it to burn your injectors, it clogs them up.

Answer 3

octane level

Answer 4

The difference in Octane on measure resistance to Self ignition or auto-ignition from high compression (like turbo engine).

Octane rating does NOT measure anything else. NOTHING.

Good Luck...

=== UPDATE ===

gasoline is compared to 100% octane (the chemial).  If it resists self detonation like 100% octane, then it is rated 100 octane.  If the gasoline acts like 85% pure octane then it is rated at 85 octane.  BUT there are no octane in gasoline.  It is just a rating.

P.S.  again octane does not measure anything else - not the energy content (not more potent), not cleaner, not better mpg,

NOTHING else.