1st Gen Crew Cab Engine

I have 2 trucks with gen 1 cummins engines in them. I get 20 mpg with my 1992 2x4 with 3.55 gears and the A518 auto trans. Best Dodge truck I have ever owned! This thing pulled a 30,000# concrete form truck with no trouble that had contaminated fuel. I highly doubt I will ever own another gas engine pickup. There is very little maintenance to do on this engine.