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 What Smart Investors Know Savvy investors take the time to separate emotion from fact. Comparing Investments This calculator compares the net gain of a taxable investment versus a tax-favored one. Best-Performing Asset Classes Bonds may outperform stocks one year only to have stocks rebound the next.