If your car note is $400/month, you should be paying $100/week and not making one payment a month. The APR interest that you pay is accrued daily, not monthly or yearly. So the more frequent you pay, the less amount of interest you pay on the loan. These folks stretch your payments out years and years so you can pay more interest. On average, a 30 year mortgage…… 15 years and 6 months of your payments goes only to interest.