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There are some "hyper-milers" that attest to the same theory. If you heat the gas up it will vaporize better and thereby burn more easily (ignite more easily). This is something many people did back in the day of carburetors because the jets would only vaporize the gas so much...fuel pressure was on the range of 5-10 psi I believe. With a modern/new/clean fuel injector and the stock 35-45 psi that fuel pumps put out, vaporization is not as much of an issue. However, if the fuel injectors are old or worn, heating the fuel may help a little. You can do it yourself by getting some bendable copper tubing and wrapping a length around the line that flows into the radiator, and wrapping a similar length around the fuel rail and/or fuel line, then link the two with some rubber tubing and a small 12v pump between the two....use anti-freeze, not water in it. It's a cheap mod (if you do it yourself) and it might work. Gassavers.org has a million little tricks. On my last fill-up I calculated mileage that was 62% above the EPA "combined" mileage for my car (probably kinda a fluke...but I do normally return 30+% above EPA rating). You'll find many others at that site doing the same. I'm not doing any of the more extreme measures though; like flares over the wheels, and shutting off the engine every time you coast to a stop. Some of these guys are getting 90+ mpg on a Prius and 60+ on old Saturns.
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