How much octane booster?

[DanGTP]

There is an octane booster at Autozone that claims to raise octane a full 6 points or the equivalent of 60 points on the same scale as other boosters. I can't remember the brand now, but it was on the top shelf... I think toluene will work better anyways and probably cost about the same as 1-2 bottles of this stuff.

[Sabrewings]

No worries. I just burned the whole tank away already and filled up with 91 from a trusted station. I was practically empty.

We'll see if it helps.