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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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HOW to gain 3mpg -- in one month--with no labor [700]
posted by someone claiming to be volvovlov on Thu Feb 27 15:53 CST 2003 >

HOW to gain 3mpg -- in one month--with no labor [700]
posted by invar on Thu Feb 27 16:21 CST 2003 > V

HOW to gain 3mpg -- in one month--with no labor [700]
posted by tvpierce on Fri Feb 28 03:16 CST 2003 > V

HOW to gain 3mpg -- in one month--with no labor [700]
posted by Dee Jay subscriber on Fri Feb 28 03:49 CST 2003 > V
- 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 > V
  - If your engine has a knock sensor, premium *will* increase mileage [700]
    posted by ronald subscriber on Mon Mar 3 02:29 CST 2003 > V
    - If your engine has a knock sensor, premium *will* increase mileage [700]
      posted by Dee Jay subscriber on Mon Mar 3 09:32 CST 2003 > V
- HOW to gain 3mpg -- in one month--with no labor [700]
  posted by Rtilghman on Sat Mar 1 06:37 CST 2003 > V

HOW to gain 3mpg -- in one month--with no labor [700]
posted by someone claiming to be harddriver on Fri Feb 28 04:59 CST 2003 > V
- HOW to gain 3mpg -- in one month--with no labor [700]
  posted by Dee Jay subscriber on Fri Feb 28 07:27 CST 2003 > V

HOW to gain 3mpg -- in one month--with no labor [700]
posted by reconron on Fri Feb 28 12:24 CST 2003 > V

HOW to gain 3mpg -- in one month--with no labor [700]
posted by citabria on Sat Mar 1 07:58 CST 2003 > V

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