I posted this in the Diesel forum originally, but thought I should post it here too. I have a 1993 K1500 Suburban with a high mileage (220,000) 350V8. The old truck is in great condition for its age, but I realistically expect to swap or rebuild this engine in a few years; nothing lasts forever, but with the 13mpg mileage I get now with the gasoline engine, I was considering installing/converting to a diesel engine instead. I know this will be more work and more expense to convert over, but was wondering if improved fuel economy would be worth the trouble? Any suggestions as to what engine (and or transmission) I need to be on the look-out for to make the swap as pain free as possible when the time comes? Or should I just trade for a good used diesel pickup or SUV?