I suggest adding the following vehicle costs.
As an example, I will include in parentheses the amount I think should be paid every game day, per car, pretending the car cost $10k.
- Insurance ($90 / game day)
- Tax ($25 / game day) - only if the vehicle was used at least once on that game day
- Garage (if it's not parked at your house) ($150 / game day)
Adjust prices depending on the car's category and price.