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If your engine has a knock sensor, premium *will* increase mileage 700

posted by  someone claiming to be Dharvey on  Fri Feb 28 14:08 CST 2003 [RELATED]

Or to put it another way--the b230f is timed and compression-ratioed for 91 (M + O) / 2 octane gas, which means, premium. At least that's what the Good Book says. If you run regular, it will start knocking and the knock sensor/ECU will retard timing and enrich the mixture to limit the knock. More gas = reduced mileage.

The intersting part that Mr. Volvovlov doesn't quite get to is that as the absolute price of gas increases (like it's doing right now) the *relative* "premium" of premium gas decreases (it's always run around, oh, 16c to 20c a gallon difference wherever I've been, no matter what the absolute price was.)

In other words, the more expensive gas is, the better a buy premium gas is. The only way to know for sure which is more economical is to check how much you mileage increases when you run 100% premium vs. 100% regular, and figure the cost per mile each way.

Except that unless the knock sensor totally damps out the knock, you'll be damaging your engine on regular. You'll have to decide how heavily to weigh the value of possible engine damage.

Happy motoring.

Doug Harvey






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