How much gas money is appropriate?

Hello everyone; Lappen is passed, first own car is soon at the door. But the question still imposes itself with the fuel money? In my circle of acquaintances this is regulated completely differently: Some put the odometer meticulously on 0, and then drive with 0,25€ calculated mileage flat rate, whereby the passenger takes over the half! The others are a little looser and expect only, from time to time, a burger. And the quite loose take no fuel money if they the strictness The last thing to do is to make it dependent on the financial situation of your passenger; who doesn’t pay anything, but if you already earn your own money, then gas money is already welcome! With those with whom I have already been with, I will of course handle it as well as they do with me. But as far as the others are concerned, what would you think is fair about Spitgeld? What would you make it dependent on? I am absolutely not a miser. he makes an elephant out of a mosquito, but I am still a student, so my fuel budget is limited – and fuel nowadays is anything but cheap. lg