If you are like most you are paying about $50-60/month more in auto insurance. That calculates out to $600+ per year, which would take an awful lot of mileage to recoup the extra expenses of the second "economical" vehicle. In otherwords it might be wiser to buy a car that costs a bit more that has fewer miles/problems and is less economical than keeping around two less reliable cars that raises your insurance costs and maintenance costs. Just in case you do have a breakdown, save a little bit of money in a savings account for the day you may need to find a taxi or a rental car.