It depends on the car.
My SE Sport ran its best on 89 until I installed the Diablo Sport chip. With anything higher, it drank it like water...
See what your MPG is on high octane and switch to 89 and compare after two or three tankfulls.
All grades of gasoline contain the same detergents. The only difference is the cumbustion additives that control the duration of the burn. The lower the octane the faster the burn. Higher Octane is actually better for Summer, and Lower Octane is better for Winter.
Pete... 98.5 SE Sport Duratec ATX (P66L) Black Clearcoat on Greystone DOB 11/21/1997 DOP 12/25/1997 PIAA 510 Super White Driving Lights SVT CAT-BACK EXHAUST (No Resonator) DiabloSport Chip (LPQ4) - Engineered To Raise Hell Too many other mods to list... Sounds sweet, runs quick... Crazy Horse Dyno @ 121.4 WHP/129.6 TQ
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