|
Premium will give you negligible gains in fuel efficiency, however, it is theoretically possible to make up for the cost difference and get better MPG. Most cars can't detect whether it's premium or 87 in the tank, so the fuel map remains the same, which means the same amount of fuel is pumped into the engine. The higher octane fuel results in a horsepower boost, but if you could remap the ECU to sip less gas when premium is in the tank, it would be probably be okay to run leaner since high octane gas is more potent and will give you the same horsepower 87 gives you while burning less of it. Also, and don't quote me on this, but I remember hearing that premium fuel is going to have a cleaner and more complete burn. But like CFG said, don't do that if you have a hot air intake, unless you want to grenade your engine.
|