Crown Vic's after they are retired from police and public service are scouped up at auction by cab companies and get up to 400,000 miles out of them. My F-150 was at the threshold of 300,000 before being T-boned by a snowbird. The 4.6L is bullet proof and there are thousands of Crown Vic's and Mercury Msrquis out there. 70,000 a year were sold to just police departments before they went out of production.