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The manual calls for minumum of 86 octane rating. The Raptor is only running 9.2:1 compression so there is no reason to run premimum in the Raptor. You will not gain any power at all by running higher octane contrary to what the petroleum industry has spent millions of dollars trying to convince comsumers of otherwise.

There are a couple of older threads that go into detail about this subject. Here is a link to one.
http://www.raptorforum.com/index.php?topic=5101.15
 

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yeah i would say stock i would run 87, and buy from a reputiable supplier such as sunoco etc. nothing like getting bad gas w/ water in it or even dirt.
 

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yeah i would say 87 in the winter and 92 or 93 for summer.
 
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