well if i knew what tank i had... I could know now... instead of going another 500 mile....06bowtie_guy;1551913; said:Really fuel tank size doesn't matter. Fill the truck up, reset the trip-ometer and drive. When you fill up again write down the mileage from the trip-ometer. Reset and do it again.
Then go to http://www.guycroft.clara.net/utils/mpgus.html Punch in the miles, gallons used and click compute.