One of the selling points I've been hearing more and more in car commercials is the idea of miles between fill-ups, which is a misleading way to sell a car.  Miles per gallon is at least a measure of engine efficiency.  Miles per fill-up is simply a measure of gas tank volume.  My car happens to have an 18-gallon tank, so I could potentially go about 500 miles between fill-ups.  But it doesn't mean it's more efficient or less gas-guzzling than a compact or a hybrid.  I guess it's all about the laziness factor. #business