Originally Posted by TJFX2EB

What was your average speed for that distance? How far did you drive? What gears do you have? 4wd or 2wd? Was it flat? Downhill? Uphill? Mix of both?

There is NO WAY to offer any help to you (even if you want it with that ridiculous comment) if you don't give us all the information. Too many variables come into play with the truck and driving down the highway to be able to come to any sort of reasonable advice or conclusion based on the extremely basic information you have provided so far.