What tractors are in the same class?

[RobertN]

You need to specify engines. The hp/torque curve for my old Kubota 19hp "B" series, and my old 1941 Farmall-A were essentially the same.

However, the old Farmall engine had twice the cubic inches, and used more fuel.

The Farmall and the Kubota could eat a 20-25hp lawn tractor engine for lunch...

Reminds me of the late 50's, early 60's LaFrance fire engines. Some had monster gas engines, and got 2 mpg.

There is no comparing gas power to diesel power. Gas engines seem to bog down very quickly and lose power under load where as diesel maintain said power. Personally I believe that when comparing the two you should probably cut the rated power of the gas by a factor of two to level the playing field.

 

[daveinnh]

I'd say that HP is as good a starting parameter as any i.e. you have to start somewhere to compare...