If you already have a vehicle and saved what you would be making in payments for the same term as your auto loan, could you earn more than 1.9% interest and the

If you already have a vehicle and saved what you would be making in payments for the same term as your auto loan, could you earn more than 1.9% interest and then purchase a vehicle for cash? If you can afford the payments, you can afford to save that much each month. The problem is either a) you don't have a vehicle now or b) you can't delay gratification of purchasing a new vehicle until you've saved up enough.