I am all for thinking about and exploring "out of the box" solutions. That is what this thread is all about. When I give advice I try to be conservative, not everyone has the same level of abilities and I can't know what any particular reader's skill level is. That is why I tend to give "conservative" advice, it is more widely useful. On this thread there are some basic accounting procedures that should be followed to do a fair comparison. Teaching or giving advice on accounting is way beyond what you can expect on this forum. BTW, when I give advice I also have to be sensitive to possible dangers that a novice can get into and try to help the reader avoid them along with the obvious stuff we all learn from experience. Take this as a positive critique, I am not trying to criticize you, it is a worthy attempt which we can all learn from. Maybe your problem is your initial conditions. If you start off with a well maintained car it will be easier to keep it running (and cheaper) than a car that is not in good condition. This can be a big trap for any new owners. They get a car and spend all of their money on it to buy it and don't have enough left over for the inevitable repairs an old car requires. It becomes a "Rolling Restoration" and is unreliable and gets them stuck everywhere. Eventually they get so disillusioned they give up. What your experiment has revealed is that you must overestimate your repair budget or you will be disappointed.
David Teitelbaum

