I don't know why the guy wants gas - but I can mention one good reason for wanting one. Winter starting when block heating is not feasable. I have several diesel tractors, dozers, crawler loaders, and backhoes at home and they are all diesel. Dyed diesel is much cheaper then gas, diesels tend to run more efficient, etc. But, I have a remote property in the Adirondack mountains with no electricity available. I have a small backhoe and dozer I've left up there and they are both gas. For that kind of use, the gas is much better. If I goe up in the winter and need to start one, there's only one battery to deal with, and no block heating needed. I went up last winter - and it was 25 below zero and I needed the dozer. I got it started just fine with the help of running jumper cables from my truck - and that never would have happened had it been a diesel. A gas engine can also be a lot cheaper and easier to maintain - depending on certain issues. Most people with general mechanical skills can repair a carbuetor, install ignition points, spark plugs, etc. But, many - even skilled mechanics don't have a clue when it comes to repairing fuel injectors and/or fuel injection pumps. Very often an injection pump can need $20 in parts to fix, but the owner winds up spending $600 for the repair since he does not know how to do it him/her self. In fact, my neighbor just had his little Deere 350 diesel repaired - and he paid a Deere dealership mechanic to come, pull the injection pump off, send it out, get it back, and reinstall it - and the total repair bill was $1100. And, the repair - if I had done it for myself - would have cost me $50 in parts and four hours total time. Obviously, a diesel is cheaper to run - if it's really going to get used. But, for someone buying one for occasional use - if not skilled on real diesel work (above simple component changing) - they can be just as well off with a gas engine.
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