Americans aren’t bashful when it comes to borrowing money to buy a car. About 85% of buyers take out a loan to pay for their new ride, according to Experian Automotive. But suppose you have enough saved up to pay in cash — is that the smartest move? Or does financing the purchase with today’s low interest rates and investing your money in the stock market make more sense? To answer those questions, NerdWallet crunched the numbers for a hypothetical consumer: A buyer with enough savings to spend $25,000 on a F-150 XL pickup, which is part of the Ford F-Series, the best-selling line of vehicles in the U.S.