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Old 09-11-2007, 11:15 AM   #23
Gadzooks Mike
Senior Member
 
Join Date: Jan 2007
Location: Opelika, AL
Posts: 162
I have now run about 5 tanks of 89 through my GZ, and the only difference I can see is that I'm about $1 poorer. I can't find any difference in the engine and nothing much in mileage, either. I might try 91, just for the heck of it. I have an extra couple of dollars this week....



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