I just hate my remarks out of full context...

The SAAB turbo engine ( regardless of fuel in the tank) makes more than enough power to gently accelerate down the road.

The knock sensor(s) working together with the computer (ECU), fuel air mixture and spark timing of the Trionic T7 engine management system to maximize engine power.

More power = more fuel

Your engine is putting out more power that is needed to gently accelerate or cruise down the road.

Conversely, when you use a lower octane fuel (87) the knock sensor (s)directs the computer to retard timing and make needed a/f adjustments.

Less engine power = less fuel.

Gasoline, regular or premium has about the same energy (115,000 btu's), hence the fuel mileage is a function of the engine management system.

More power = more boost = more fuel = LOWER Mpgs.

You can read the full context of Mike and my discussion on this topic on the 9-5 BB if you like. The post is a May 1 posting called "Regular Unleaded gas".

Drivers generally "say" that 87 gives lower mileage, and my reply is posted over with the 9-5 discussion to the effect that after driving on 93/92 octane, switching to 87 is a loss of torque. Drivers find themselves pressing much harder on the gas pedal to get the power back which results in lower fuel economy.

Seeing 2 identically equipped SAAB turbos in the lab--one with 87 fuel and the other with 93 fuel shows the results scientifically.


Thanks

TG
26 years of driving SAABS
1.26 million SAAB miles behind-the-wheel







posted by 66.227.17...

• Poll: Do you get better fuel mileage on premium?, Mike Lynch`, Sat, 3 May 2003 18:13:23
  • Hey TG - 9 to 5 say yes....., Mike Lynch , Tue, 6 May 2003 18:36:48
  • no, JimBlake , Tue, 6 May 2003 05:14:54
  • Yes, Steve L, Mon, 5 May 2003 14:01:34
  • I think so, No.9, Mon, 5 May 2003 10:55:25
  • Re: Poll: Do you get better fuel mileage on premium?, dtech, Mon, 5 May 2003 08:57:38
  • Yes, Rick D., Mon, 5 May 2003 08:52:12
  • Re: Poll: Do you get better fuel mileage on premium?, KeithCT, Mon, 5 May 2003 08:16:11
  • Don't know for Saab and Turbo, but I do a test on my, SWEDECAR , Sun, 4 May 2003 09:45:09
    • Re: Don't know for Saab and Turbo, but I do a test on my, TG, Sun, 4 May 2003 14:00:33
  • negatory, TML , Sun, 4 May 2003 09:19:09
  • Not in my turbo. More power, less MPG, Scobby, Sun, 4 May 2003 06:04:18
  • yes, and..., chris74, Sun, 4 May 2003 05:36:26
    • whoops..., chris74, Sun, 4 May 2003 09:07:08
    • Re: yes, and..., TG, Sun, 4 May 2003 08:35:44
  • Here's what I said, Mike... //LONG, TG, Sun, 4 May 2003 04:46:02 <-- Viewing This Message
    • Well thought out....., Mike Lynch , Sun, 4 May 2003 13:38:03
      • that BMW study..., JimBlake , Tue, 6 May 2003 11:57:28
      • recently read similiar comparison, Aero'ed, Mon, 5 May 2003 10:28:04
      • Re: Well thought out....., TG, Sun, 4 May 2003 13:57:37
        • TG disproves his own "theory", Greg Netzner, Mon, 5 May 2003 10:00:23
          • 16v n/a EZK, JimBlake , Tue, 6 May 2003 05:05:18
            • You're probably right, Greg Netzner, Tue, 6 May 2003 07:14:12
          • Greg, you are just funny--I'm still laughing at this !!, TG, Mon, 5 May 2003 19:20:24
            • All I'm saying is ..., Greg Netzner, Tue, 6 May 2003 09:04:47
          • It's still up for grabs...thanks..., Mike Lynch , Mon, 5 May 2003 14:52:47
        • Your becoming more compelling...., Mike Lynch , Sun, 4 May 2003 18:08:48
  • I'll say yes..., Jeremy R., Sat, 3 May 2003 20:01:23
  • yep - usually 50 - 75km + out of a tank using 98RON. nm, sab, Sat, 3 May 2003 20:00:39
  • Re: Poll: Do you get better fuel mileage on premium?, Liam, Sat, 3 May 2003 18:47:03
    • Re: premium and regular have the same (M), Jon906, Sat, 3 May 2003 20:59:22

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