Just did our first trip of any consequence with our WhiteHawk 27DSRL and '05 Ram 3500. Left home with a full tank of fuel and only 21 miles on the trip odo on that tank full. Arrived at Marianna in the Panhandle and needed fuel, filled up an calculated mileage came out to 10.6 ? :h Return trip home, same route and distance, fueled up after parking the trailer and mileage worked out to 12.6/gal. Trying to figure out why the difference.........:h