Mind me asking how you accomplish this? Downhill for 50 miles in Neutral with a tailwind? Secret reserve tank somewhere? You have to be running the tank to damn near last drop before filling up!
Well, minus the blower, I achieve it by driving 60 miles a day, five days a week on the highway at 75-85. I do very little city driving and I usually fill up around 320 miles with a gallon or more still in the tank.