There are generally taxes (e.g., car or gas taxes) that cover the costs. I don't know about Germany's situation, but it is not impossible to make that net zero.
And these comparisons often exclude externalities like carbon emissions, pollution from tires and brakes, road accident costs, noise pollution and the cost of suburban sprawl.
If you would even attempt it to make it net zero you would get truly ungodly amounts of pushback, I don't think you understand how bad it would be. Truly, for those used to a privilege, fairness is an attack.
Furthermore: you have a state of affairs where you are pretty much forced to own and drive a car to e.g. get to work or move around. You make it reflect its true cost making it impossible to afford for anyone except the rich. What now?
