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From what I've read about fuel warming on here and other sites, it depends on the car. The idea is that warm fuel atomizes better which provides a better burn, likely being done in conjunction with a warm air intake. Some of the sites I looked at I would question their highly dramatic results, but the theory probably has a good amount of merit.
For the DIY route I'd say run some good quality line around/near the exhaust manifold to heat it up, just be sure to keep it somewhat easily reversible so you can give it a good A-B-A test and use something that can easily withstand the temps.
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