Re: Max highway MPG? - Saab 900 Bulletin Board - Saabnet.com
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Re: Max highway MPG?
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Posted by Carl (more from Carl) on Wed, 16 Jun 2010 05:11:52 Share Post by Email
In Reply to: Max highway MPG?, Ian Scott, Tue, 15 Jun 2010 17:52:02
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If you really want to go through the effort....
On my 86 SPG, this is what I do on my long trips.
I'm completely stock (base boost is about 6.5psi) so take that into consideration.
All I have to do it crank the timing up to 20 degrees.
The car will knock on long hills if you push it, but I had no problems on the highway.

I averaged 33mpg on two tanks of gas (well over 750 miles up I-81 from Statesville NC). No problem on the I-77 monster hill.

The APC will cut off all the fun and force you do drive economically. The car did knock when I was in VT/NH hills after everything was heat soaked. The fuel up there isn't as good w/ the 10%+ ethanol which my car hates. GO to my destination, set timing back to 17 and no problem.

I do not know how the AID mod changes things, probably add a few more degrees of timing. Just keep your timing light with you and you should be good to go.


posted by 69.180.55...

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