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This testing doesn't even work because he has two different driving styles depending on how how filled his tank. If he filled 5 gallons he would drive more conservatively, while when he filled the tank up full I'm sure he'd drive normally.
For him to be able to say that 5 gallon fill-up gets better mpg the driving styles would have to be the same. It shouldn't be any more difficult to drive conservatively when he has a full tank.
I get what he means by having less gas in the tank would cause him to watch the tank and drive easier, If it ends up working for him, the money he saved in gas he's just going to put back in the vehicle by buying a new fuel pump because he burnt out the one in his vehicle.
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