Full load is way too much unless you're arctic trucking. The lowest setting is plenty for my sun room until it gets below 20f or it's especially windy. This use

Full load is way too much unless you're arctic trucking. The lowest setting is plenty for my sun room until it gets below 20f or it's especially windy. This uses about a gallon in 6 hours. But you're right, without any insulation, the moving vehicle will lose heat much faster. The room has terrible insulation but at least it has bare brick for the bottom 3 feet which probably retains a lot of the heat. I suspect with proper insulation your fuel usage would be drastically reduced.