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 Retirement Questions That Have Nothing to Do With Money Things to consider before retirement. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. Tax Efficiency in Retirement What role would taxes play in your investment decisions?