If you stick with High Octane pertro you will get better gas mileage. PERIOD. I dont care what anyone says, 93 or higher it will be better. My dumb a$$ girlfriend used my car and put 87 in it and I got like 300 on that tank
The read somewhere, either on the car or in the manual, that it's "recommended" using 87 octane. My mechanic tells me to juice it with Injector cleaner, 93 octane and dry gas on every oil change. I always thought going with a higher detergency would burn out my cylinder walls faster. I get about 300+ mpg on a tank, too.. I'd much rather take 400+, that's for sure! I have to use my trip odo to measure when I need go-go juice 'cause the damn gas guage HAS NEVER WORKED right!!