LOLOL, no offense but you can't cool anything lower than the surrounding air: Oil that is running through an engine is HOT....water that's in the coolant system is HOT...fuel that's sitting in a tank in the back of your car is not hot...so what would be the use?
Send me a link to this said fuel cooler...the ONLY reason you'd ever want or need to cool fuel down to the ambient temperature is if you are using a fuel pump that doesn't have a regulator connected to it...ie 1400hp drag fuel pumps that run wide open 100% of the time.
*edit*
now if you took a double walled reservoir of some sort and surrounded the fuel with a laye of dry ice and supercooled it then you might see some benefit from it....now imagine doing that with an intake or intake manifold too
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