Track Day fuel choices

NoQuarter

Major
Nov 24, 2017
1,662
1,066
0
Indiana, USA
Ride
Z4 35is, 535xi, X5 35i
Depends on your tune and if you need the octane to prevent knocks.

If you are running good at 93 then the higher fuels won't help i don't think.
 

typedRew

Sergeant
Feb 25, 2019
412
221
0
Ride
2009 335i xDrive
run the best unleaded fuel you can afford, having extra knock resistance when beating the car on track is a great option

you might not benefit from it much, but itll help keep timing corrections and loss of power with heat soak to a minimum. plus its good insurance
 
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langsbr

Captain
Apr 5, 2017
1,266
771
0
Ride
07 335i 6MT e90
I would run a few gallons of ethanol. The ethanol will give a bit more octane, but also the added fuel will help keep the pistons cool, which is something you definitely want if pushing the car hard for multiple laps.