Hahah, clearly it comes down to the type of person each of us is. Some do (and always will) gather the data, analyze it, make lists, etc. (that's me) - while others hate that (my wife, for instance ).
I just want to know how much (in general) this or that car costs me. How much of this are repairs? and fuel? what are the average monthly spendings? average cost per mile driven? total cost of particular modification project? and so on.
I can relate to this, TOTALLY... Personally, I like tracking category of each transaction (whether it was maintenance, repair, mods...) but at the same time I want to know if that were fuel, parts, a 3rd party service and so on. To complicate further, I sometimes bundle a number of transactions into 'projects'...
Because of this I cannot switch to some nice app and get rid of the spreadsheets so far. And even though they are pretty cumbersome to use, all the apps I tried were not even close to what I was looking for (most of them is focused on fuel consumption )