I have calculated the cost of the original deisel plus all the repairs and extra costs of servicing ... and I do think that buying a gas truck will actually be less expensive up front and to maintain. I know that I will be losing fuel milage and hill climbing strength, but I do not do a lot of that, so no big loss there.
I have done all of the required maintance on my 1999 and still have had around $5000 worth of work done on it. If I had gotten the 250,000 miles or so that I read so many other people getting, I probably would stick with deisel, but my 167K is not much more than a gas truck my inlaws have used to pull their RV, and it is also a 1999. They have never had a major item need replacing.
However, I am not dead set against a deisel. Just not sure they are the best.