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 Message Thank you! Oops! Related Content The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Does Your Credit Score Affect Your Insurance Rates? Your credit score may influence how much you pay for auto and home insurance. Social Security: Maximizing Benefits There are other ways to maximize Social Security benefits, in addition to waiting to claim them.