For the cash for clunkers program? The combined city/highway gas mileage must be 18 mpg or less. http://www.fueleconomy.gov/feg/findacar.htm They are using the mileage the vehicles supposedly got when sold. The 1990 Lincoln Continental which gets about 14 mpg, according to my neighbor, doesn't qualify. The advertised mileage at the time of sale was 19 MPG.