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Cooling the fuel to a measurable enough amount to show a gain would be more complicated and expensive than worth it. That's usually one of those last tricks that people use to get everything. It's been done before...and for a long time. Old drag racing trick to "ice down" the manifold, literally, on a carbureted engine. Just chilling the fuel to say ice water cold from 110F, would show a gain. How much? 3-5% maybe? That's about a 3-5HP gain on a 110HP carbureted engine. Combine that with other mods and it's the right direction for sure. On a stock fuel injected engine with no change in the tune I doubt would show anything. It'll just inject more or less to keep the A/F ratio in spec.

A true ambient (cold) air intake would gain you more. 1% per 10F degree drop in intake temp is the norm.

http://focus.c-f-m.com/s-maxcoolcanpolished.aspx
 
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