That’s very astute of you to recognize that finance charges aren’t necessarily the same as interest charges.
Furthermore, this is also why you see a difference between interest rate and APR. An interest rate includes only the interest, while the APR, which is always slightly higher, is the rate paid for interest plus any additional fees rolled into the loan.
Overall, the fees that are rolled into your loan are relatively small. You may only see a few hundred bucks extra or less over the life of the loan.