Interested in a Fuel Efficient Car? Estimate how many months it may take to recover the out-of-pocket costs when buying a more efficient vehicle. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content How Women Can Prepare For Retirement Are women prepared for a 20-year retirement? Deciding When to Take Social Security One of the most common questions people ask about Social Security is when they should start taking benefits. Roth IRA for Kids Learn about the benefits and requirements of opening a Roth IRA for kids.