well yea, you really really should run higher octane, i believe you should run 93, otherwise you will get horrible gas mileage, so youd actually save yourself $$ on gas, and if you drive your car right, kinda depends on ur chip, you may actually get better gas mileage, of course, assuming you go 93
and if you think about it, in the end, its like what, 5 bucks more for a whole tank?