this is how i think of it... you dont need to know how fast your car is on 108 because you dont drive it with 108. you wanna know how fast is your car on normal octane, because thats what you normally use.
lets say even if the 108 give you .2 seconds in the 1/4 (which is highly unlikely). Thats useless, cuz when you go home and fill up on 93, your still running a time with the added .2 seconds you lost only because of high octane gas.
all im saying is that why do you wanna know the fastest your car CAN be. dont you really wanna know how fast your car is ALL the time?
2002 black SVT, fully built turbo.. SOLD
Remember these 3 words: cheap, reliable, fast.
You can have 2 of them, but the third will not apply.