Originally posted by tigerty
you burn more gas climing up and down hills every day stop and go traffic can eat up your gas your car might perform better if you use 89 or 93 octain because of the bigger engine .
Well I counted three things wrong.
1) When I drive the piss out of my car, I get about 280 miles per tank. Normally I get about 380-400. He should be getting far better mileage.
2) Adding 93 will not help :slap: The octane rating has nothing to do with performance, it is simply a rating for when the fuel will detonate. The unique thing about the 2003 Accord V6 is that putting in 91 will actually increase horsepower and torque by about 10 and 10 ft-lbs, but it's a rare case of an engine that has an ECU that advances timing with 91 octane. My engine actually loses a few horsepower with 91 octane. You should always go with the recommended octane. Mileage will certainly not improve.
3) The size of the engine has nothing to do with anything.