How to calculate the fuel cost AA of carpooling in go on road trip?

At present, the calculation methods of self-driving expenses and carpooling expenses are generally recognized by travelers when traveling on the road: the self-driving expenses of self-driving mainly consist of three parts, including vehicle loss expenses (including insurance and maintenance expenses), fuel expenses, bridge crossing and parking fees. (Vehicle wear can be calculated by the owner with reference to the replacement cycle of automobile wearing parts. Mode A: In the family mode, each vehicle bears its own expenses and responsibilities. Mode B: The owner provides the vehicle and drives it. There are more than three carpoolers (excluding the owner) in the vehicle, and the toll for crossing the road and bridge is the same as AA. The owner does not participate in the A fee. Vehicle wear, maintenance and fault repair shall be borne by the owner himself. Mode C: The owner provides the vehicle and drives it. If there are only two carpoolers in the car (excluding the owner), the owner will bear 20% of the toll for crossing the bridge and the remaining 80%. The two carpoolers are both AA, and the loss, maintenance and fault repair of the vehicle shall be borne by the owner himself. Mode D: The owner provides the vehicle and drives it, and only takes 1 person (excluding the owner). The owner bears 40% of the toll and bridge crossing fees, and the remaining 60% is borne by the carpooler. The owner is responsible for the loss, maintenance and fault repair of the vehicle. The owner of the vehicle shall take out insurance on schedule to ensure the normal driving and driving safety of the vehicle, and bear the maintenance expenses (including maintenance, tire replacement, tire repair, other maintenance expenses and traffic violation expenses) incurred on the road. The accident is solved according to traffic regulations, and the owner does not bear any responsibility other than that stipulated by law! Accommodation, tickets, meals and other expenses. The expenses incurred during the trip are paid by the driver and carpooler according to the actual situation. Mode of carpooling activities: a. Carpoolers must arrive at the meeting place on time, and budget the approximate amount of crossing the road, crossing the bridge, gas fee and parking fee with the owner before the vehicle leaves, and then pay the A fee to the owner in advance for use on the road. Carpoolers are responsible for bookkeeping, and after the activity, they will refund more and make up less. B the car owner needs to fill up the gas tank at the gas station near the starting point at his own expense under the supervision of the carpooler. After the event, the car owners and carpoolers also returned to the gas station near the starting point of the event, filled up the gas charge, returned the car owner with a box of gas, and added the toll to get the total cost generated by this fee. Of course, the above carpooling methods need to be made clear before traveling, so as to be recognized by drivers and carpoolers.