[TW]Fox;24518350 said:What about those of us who have purchased cars so long ago we've depreciated them to zero on our personal balance sheet and consider there to be zero meaningful capital tied up in them
In that case, take the full purchase cost, then divide by the months of ownership and apply it to the %. Every extra month of ownership can be recalculated to suit if so desired.
Edit; beaten by rodenal, again.