What gas is ussed in racing car tiers?

Answer 1

Usually they run alchohal, but in dirt trak cars, they might use regular gasoline.

It depends on the racecar; Nascar cars use 110 octan leaded gasoline, Indy cars use pure methanol, and Drag cars use Nitro methan.

Answer 2

Some use Nitrogen, although the benefits are marginal.

Answer 3

The official fuel of Nascar is Sunoco 260 GTXracing gasoline. It is a 98 octane unleaded fuel, specifically engineered for high-performance engines.