Tires on both the TV and 5er filled with Helium, all three waste tanks filled with Helium, fresh water tank filled with Helium, air bladder inside 5er filled with Helium - total weight for vehicle and trailer less than 5 ounces. Floated from Abilene to Hobbs New Mexico on a dram of Diesel equating to maybe 15,000 miles per gallon. Too bad though, we were hoping to go the Shreveport but the wind was against us
