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If gas is 8lbs/USgallon and you are buying an extra 14 gallons more than you might (to fill the tank) then you are talking an extra 132 lbs. If every 100lbs can mean a 2% change in FE... there you go. Not tremendous but maybe not insignificant, depending on your car's base mpgs. I fill the tank all the way. I ran it down brutally low last time and saw pumping problems. Never again.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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