[jcp123]

Hmm... my Civic is about 56 ton mpg, with myself, fuel, and usually loaded with groceries and clothes for my four week over-the-road trucking stints, or minus the groceries as I head home.

2290lb curb weight + me + supplies is around 2550lb or 1.275 tons.
44.0mpg x 1.275 = 56.

My Freightliner, loaded to the gills on the flatlands with little wind would be just shy of 300 ton mpg (~39.5 tons x 7.5mpg), or about 220 if I'm fighting through the mountains (39.5 tons x ~5.5mpg). No cargo in the trailer, I'll see about ~160 tmpg (16.5 tons x 9.5mpg). Bobtailing drops me to around 110tmpg (9.5 tons x 11ish mpg)