The weight difference is pretty negligible. Not going to make much of a difference, although it will make a slight difference and give you better gas mileage without the extra weight of the gas. However, you supposedly lose more gas to evaporation in the 2nd half of the tank, because there are more gas fumes evaporating. The more space available for gas to evaporate the faster it will evaporate or so I've read... I would think it would be more dependent upon surface area of the gasoline exposed to air, which shouldn't change much. But I'm not really sure how gasoline evaporates.
Either way, I think it's basically a myth because either way you look at it, weight savings vs gas evaporation, the loss of gas mileage will be pretty insignificant. Of course the smaller the car, the more dramatic effect weight loss has on the gas mileage.
Regardless, there are MANY other things one can do to effectively get better gas mileage that are actually PROVEN to work. lol Inflate your tires, give your car a tune up.
Either way, I think it's basically a myth because either way you look at it, weight savings vs gas evaporation, the loss of gas mileage will be pretty insignificant. Of course the smaller the car, the more dramatic effect weight loss has on the gas mileage.
Regardless, there are MANY other things one can do to effectively get better gas mileage that are actually PROVEN to work. lol Inflate your tires, give your car a tune up.
