Company cars without private use / monetary advantage

Hello, I’m in a situation I haven’t found anything on the net. I hope you can help me. I work for a company in bicycle distance with a customer at 35km distance. We have an office there on the premises. So I ride my bike to the company parking lot in the morning, get into the car, drive to the customer and drive back to the company parking lot and home with the bike in the evening. During my stay with the customer I don’t drive at all. I am employed by the company around the corner and my location is the office with the customer. I don’t know what that means with regard to the first workplace. Up to Corona I have solved this via a ride, but was forbidden because of contagion risk. Now the question arises to me: How is this with a monetary advantage? I have unfortunately not kept a daily travel book so far, had no idea about it. I have read that you have to prove at least 3 months. I’d drive the car for another 3 months and I could still get it started today. Also, you should be able to share the kilometers you drive fairly cleanly through the days and would just come to the conclusion that at best I have made a detour over the gas station. I’m afraid of a huge tax post payment. The car costs about 30,000€ and I drive 70 km a day. Would be with 1% rule damn expensive. But here I read again and again that the company car from to H I don’t know how to get the first place of work and place of duty in all the regulations. Does anyone have any advice? Would be very grateful!