Everyone is all hot on torque, but what matters is power. You just have
to shift down to get the power you need. Look at the rock crawlers,
they have gears so low they can go 1 mph at 5000 rpm! Power is what you
need. Torquey motors give good power at low rpms, which is a kick I
guess.

Diesel fuel has more btus (watts) per gallon than gasoline. Diesels
engines can be run at higher compression ratios because engines wont
ping with the diesel fuel. I think just about all diesel engines are
fuel injected (but so are gas now). Anyway, both work. Personally I
don't like the noisy, dirty, stinky diesel (prefer gasoline), but they
do work well. Make an engine with really big cylinders and big flywheel
and you will have a torqy sob no mater what fuel you use.