I don't have Thermal Expansion or Immersive Engineering/Petroleum installed, and thus I can't power diesel engines with the mods I have.

In the immersive railroading config, you can define anything you want as a fuel. You just need the forge fluid name for it.

And the numbers are what? Burning rate (mB/t)?

It's a burn time. (t/mB) Anywhere from 150-170 should be fine for mek. gas. I'd personally put creosote down near 100-110.

Alright, thank you for the explanation, closing