A newer model lincold Town car will get about twenty to twenty four miles to the gallon.This varies depending on whether you are driving in city traffic or on an open road or highway.
Due to Lincoln's larger engines as well as heavy bodies, the fuel economy is still not that great on new cars. The 2010 model will only get around 14/19mpg.
I would say that you will proabley be looking at a good gas mileage, In a newer one you could look at 25 mpg going 75 mph. Thats not bad at all, good car to use on long trips if you love vacation.