Drifting

Any recommendations for cheaper 100 octane gas anywhere from Denver north to Fort Collins?

want to sweeten the mix for my GT3 and I’m sure there must be cheaper options than the track.

GrantG

I paid $6.999 today for Ethanol-Free 91 this morning in Lakewood.

Doubt you can find 100 octane for less than $12 per gallon.

I think the 100 Octane Unleaded 260 GT is a good choice and can find stations here:

https://www.sunocoracefuels.com/fuel-finder

In Colorado, there is very little point in using very high octane fuel with NA engine since the air density is so low (altitude effectively lowers the static compression and need for and benefit from high octane). Maybe a couple/few gallons of 100 Octane with a full tank of 91 is beneficial (but I prefer to avoid all Ethanol - I use only Ethanol-Free 91 - and the road legal race fuel has Ethanol/Oxygenation in Colorado).

I think you can buy 100 Octane Ethanol-Free in a drum, but not from a pump here.

Ethanol-Free fuel finder:
https://www.pure-gas.org/

big greasy taco

most FBO's at small airports have 100LL, which is usually much cheaper than "race gas".... virtually identical FYI. Use it in my boats / jet skis. I pay ~$7 per gallon

GrantG

I’ve never heard of that, so I Googled and looks like a little lead content which car really kill Catalytic Converters (I imagine OPF’s may not like it either). Also sounds like tuning would be a little different.

https://classicmotorsports.com/artic...vgas-your-car/

https://www.mcico.com/jet-fuel-vs-gasoline

Drifting

Did some more reading after your post. Thank you. I'll stick with 91 for now.

Do you avoid ethanol mostly for concern of the rubber/plastic tubing in GT3 or something else?

I thought modern cars were made to deal with ethanol, but please educate me if I'm missing something,

GrantG

Yeah, it’s the wear to fuel system parts, but it also makes the car slower. Unless you tune specifically for Ethanol, you’ll make less power than with Ethanol-free.

I use E85 in my Evo IX (special fuel map and set manual boost controller higher to 29psi boost). But in NA car that is not designed to run Ethanol (by running higher compression and richer fuel delivery) it makes power suffer.

Gasoline has more energy by volume than Ethanol…