My International weighed 14,000 lbs and had the 300 hp with Allison 6 speed, 4:44 rear axle ratio and pulling the Mobile Suites at posted sppeds or about 62-65 mph gave up just at 8 mpg or 7.5 Many Freightliner rigs could go as high as 10-11 or even 12 mpg. So they would say. They seemed to be lighter trucks with Cat motors where i hsd the international motor.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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