It's a cummins 6at from a UPS truck. I sort of agree, it could or should do better. This truck IS pretty heavy though. I think I was doing about 65 mph for a lot of it . Here's some specs 210 cu in. 120 hp , about 750-800 lbs. You can see it in my youtube posting 59 f350 with cummins 6at. It sounds about as loud and rattly as a cummins 12 valve in a dodge. Maybe a 39 cornbinder is more aerodynamic than a fridge. Duh, what isn't? Then there's the exaggeration factor with the '39 guy. My internet is down at my place and maybe it won't be fixed til Tuesday with the holiday.... I'm at the library checking email and I feel like a homeless nerd if there is such a thing.