Real rocket scientists. It takes the same amount of fuel to run daily whether you keep your tank full or half full.......wtf??
Actually, I have to disagree with you on that. If you run the truck full on gas at the start of every day, and you only need, say, a little less than 1/2 of the gas to run the route, you get (marginally) less gas mileage because the full tank is heavier than the 1/2 empty one. I'm surprised they haven't started telling drivers to be lighter on the throttle when accelerating to save gas, though.