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Re: Fuel S80 99

posted by  someone claiming to be John on  Mon Apr 23 03:52 CST 2001 [RELATED]

My mechanic said that in the winter, 87 is just fine, and in the summer it "seems to run more efficiently on the higher stuff."

The manual states that minimum 91 AKI (anti-knock index) is required, but from research at the Mobil gas website, it seems that when the pump gas says "87" it is the R+M number, which is different from AKI. I forget the actual number, but the AKI number for "87" pump gas (from Mobil anyway) is definitely greater than 91, like around 93 or 94 I think.

Regardless of the math and figures, I have noticed that my T-6 runs a little more powerfully on 89 or higher, especially in the summer time, and since I push it a lot, I will mostly use 89 this summer (I've been using 87). I notice that on 87 my turbos really kick in when I floor it, and then back off quickly, perhaps because of the pinging, but after a couple of tanks of super, it doesn't do it as much.

-John

'99 S80 T-6





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