I have a very rare 1984 diesel Toyota pickup. It gets 33-34 mpg, just a little less that the EPA sticker said. I bought it new for cash and have had no car payments for 14 years and counting. I have never added a quart of oil between changes and I have 135,000 miles on the orig. I have chrome wheels and a nice repaint that needs to be done again.
Disadvantages are lack of power and more importantly high speed freeway cruising.
Part of the fun is, there are no others like it in good condition. The guys at the Toyota dealer want to buy it. I got the Ziebart treatment when I bought it, which seems to have helped preserve the frame and cab. They have very little rust. The back end rusted apart though, and I put a wood bed on it a couple of years ago.