Torco 108 Purchase at Firebird.

I put 5 gallons of Torco 108 Unleaded in my empty tank last night at Firebird. Did two runs.

I noticed some detonation on the drive home on the 23 degree race tune?

I just hope the car was not detonating down the track.

My octane requirement for 20 PSI with 23 Degrees would be safe with 100 octane. Very Safe with 108.

I placed the 16 degree tune back in and the detonation is gone.

This is obviously a fuel quality problem.

I never had any issues with VP 109.

I will only be using VP race fuels in the future.