modern tractors run on diesel (although I have two that run on gas) for the low end torque curve and slight increase in fuel-to-energy conversion efficiency. A

modern tractors run on diesel (although I have two that run on gas) for the low end torque curve and slight increase in fuel-to-energy conversion efficiency. Although my person preference is gas tractors, commercial farmers all use diesel for these reasons. For me, gas tractors so much easier to rebuild a carburetor then a diesel injection pump. My diesel tractor has been down for almost a half year due to an injection pump rebuild (Case 530CK Roosamaster pump)