[IsaacCarlson]

If you have an automatic tranny, you will probably need a tranny controller.
Most folks that swap small diesels into trucks use manual transmissions because there is no wiring to worry about. The diesel should have no problem hauling you around. Have you thought about a Cummins 4BT? Those are strong and get great mileage. I have been wanting one for a while and even called the company looking for more info. I figured on about 40 MPG as a minimum.

Small diesels use almost no fuel. I think most small non turbo diesels use about 2-2.5 gallons per hour when wide open and full load. This would give you around 30 mpg at 60 mph IF you were working that engine to it's limit. MOst of the time you are at less than half load, so the mileage would be 40-50 mpg. This is because the GPH would drop to about 1-1.5.

Deutz is another one to look at. Even john deere or caterpillar. They all make good diesels. My brother had an isuzu diesel and hated it. The design was bad to start with and it leaked everything. Hope this helps.

NEVER RUN ONE OUT OF FUEL!!!! Injector pumps cost $$$$!