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I think there are alot of other things you can do to get better mileage
Try hypermiling. Driving style often makes up for more than 50% of the gains on here
Check that your car is tuned up Filters spark plugs oil change Etc.
And max ur tires up to full pressure for lower rolling resistance those all will likely help more than just a fuel heater will
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(No actual EPA numbers for car just used F/E numbers when i first got it)
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