Lots 'a miles
A few months ago I spoke with the mechanic for a local limo outfit that runs 20 Town cars. He says that that they need little maint. as all the miles are highway miles to and from the airports. They do not change the transmission fluid and have only had one transmission failure in twelve years. They sell their TC's when they hit 300,000 miles. So, all you have to do is keep your eye on the battery, fan belts. You may need a water pump at some point.