I put all my reciepts in a box with no desire to add them up.
If and when she asks me how much i spent on a car i will tell her, Honey i dont drink, i dont smoke, i dont gamble, and i dont visit the b**by bars (even though i like too). When she needs me, she knows where i am. So dont break my chops. And i am sure that would put the question of how much did you spend on a car to rest for awhile.haha