Unfortunately, no you can not. The most common way to lower your loan balance faster is to pay your regularly scheduled payment
( principle & interest ) PLUS an additional amount on the principle, if you're financially able to do so. Also, shop around for an auto loan which includes a lower interest rate (APR). And remember to never miss a scheduled payment. If it looks like you're going to miss a scheduled payment, call your lender to discuss any options they may offer. Best Regards, me.