Anecdotally, ‘off road’ diesel (the purple stuff in the US) is not a low sulphur on-road fuel and its performance is much better in pick em ups and brodozers versus pump diesel. Its pollution potential is also higher than low sulfur fuel.

Running off road diesel is an unspoken thing. I’m in a town now but out in the sticks most guys I know run their on road trucks on off-road fuel. I have friends who farm and if I wanted they’d sell me off-road fuel for my personal use, if I still had my diesel. With the coming change of no longer having to perform annual vehicle inspection, it’s going to be even worse.