I know this topic is closed, more than likely because it has nothing to do with "car and truck gas engine oil", but I think, given the amount of confusion and misdirected faults, the administrators might consider a section on fuels. At any rate, I would like to say this regarding the original post. Your suggested mileage has NOTHING to do with what you might get in the real world. It is not intended to even approximate what mileage you might get in the real world and any similarities to actual milage are purely coincidental! The reason for this is that the posted milage numbers are calculated BACKWARDS from the amount of emissions measured at the tailpipe. Less emissions = higher mileage numbers! This is a farce perpetrated on the American public MANY years ago by the EPA which has become the standard for all companies wishing to sell cars in the U.S. It just so happens that most times a higher number on the window sticker gets close to a higher number in real life, and can be used as a general guide when deciding your purchase...but by no means is it now or has it ever been meant to portray the ACTUAL mpg that you might expect to get from that car, EVER.