Gas engine and Diesel of same specs.Pull the same.

If you are a putting liquid that isn't burning in the combustion chamber, it is basically having the same effect as water injection. Something that isn't burning, can't produce heat. The whole idea behind internal combustion engines is converting energy from expanding gasses to mechanincal energy. If the fuel doesn't burn, there are no gasses to expand and if there is not enough air, the fuel doesn't burn.