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Use less fuel

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Why are you running 15 and not 20?
The only way you can burn less is to tune it right and run it slightly lean when you race. Better performance but a shorter engine life.
 
I'd recommend 20% as it's the standard- really if you want to make your fuel last longer lean it out (decreases engine life, increases performance) or do some weight reduction. The quality of the fuel also makes a difference as if the fuel burns cleaner, less fuel will be needed and the engine will run better and more economically. :)
 
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