Once you account for
* the opportunity cost of the up-front money you paid for your car (or the cost of the loan to buy it) compared to investing that money or simply putting it in a high-interest savings account
* the cost of car insurance
* the cost of car maintenance
* the cost of depreciation
* the cost of fuel
it adds up very very quickly to gigantic quantities of money.
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> 30-40€ one way taxi rides get expensive pretty quickly and 40-60€ day rents for car is not that many uses...
Nobody is advocating you rely on taxi rides to get around. 40-60€ day rentals, or 1€/km metered rentals absolute can save you money relative to car ownership so long as you don't use them super often.