What octane fuel does NASCAR use?

Question

What octane fuel does NASCAR use?

Answer 1

somtin' from sunoco.

Answer 2

i heard the same thing last week - 99 octane, but that article clearly shows 98.  so i'll say 98.5.  final answer.

and that is down since they switched to unleaded about half-way through last season from like 110 (i think it was a little lower, but can't find the reference right now).

Answer 3

yes, it is 99

Answer 4

I heard them mention it was 98 octane in the last race.  I remember buying that grade at the pump in 1978.

Answer 5

Last I heard over the weekend was 99 octane.  I believe it was 110 before they went to unleaded.

Answer 6

either 99 or 98 it was higher before unleaded

Answer 7

Since they went to unleaded fuel, they are using Sunoco 260 GTX.  Here is  a website that gives its specs:

http://www.bazellracefuels.com/racingfue...

Its 98 octane.