In about six weeks, the country will celebrate that most American of holidays, Tax Day. What, you may wonder, do cars have to do with taxes? Well, certain hybrid and alternative-fuel vehicles are eligible for tax credits of up to $4,000, and that’s something you don’t want to miss out on. Cars.com’s Mike Hanley and Kelsey Mays answer a number of the most common questions people have about tax credits and hybrid cars, as well as run down the current credits on eligible vehicles.