Diesels use less to idle than a gas engine.
I don't a vehicle that old would be able to do a mpg readout with a computer. You can keep track of it manually.
I've done a bit of towing and hauling with pickup trucks. It is my understanding that the more load you have, the higher you put the tire pressures (better for the tires).
... and I thought the only vehicles that had 3 speed transmissions in 1994 were YJ wranglers.
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