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I believe its 16 percent if the car makes 416 hp on 91 at the crank and 350 at the wheels. If it makes 416 on 93 at the crank and 370 at the wheels then its 11 percent. 11 seems really low so i'm going to go with 16. The driveline is pretty good in the F stock :D.
 

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I have pocket dyno on the iphone and its crap. If this app actually works let me know.
 

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The 91 and 93 are the octane of the gas being used. There are plenty of dyno sheets showing that on 91 the F makes around 350 at the wheels and on 93 it makes about 370 at the wheels. The factory hp rating is 416 at the crank. I don;t know if that is on 91 or 93 pump gas. Does it make sense now?
 
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