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Old 08-14-2010, 04:11 PM   #9
emory70
Senior Member
 
Join Date: Jul 2010
Location: jacksonville fl
Posts: 100
Re: 89 Octane okay?????

different method to determine octane... i love that crap. hmm... actual octane rating? no, we prefer the theoretical octane number.

when i had my 99 f150, i tried the different grades. the truck got better mileage with the higher grades, but it wasn't enough to make up for the price.
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