Source | Cezary Piwowarski. Introduced in 1991, Ford's modular 4.6 V8 has been a very successful engine, with millions in circulation. While it's not a powerhouse, the 4.6 offers good fuel economy and can easily run well over 200,000 miles—state police will use Crown Victorias with 4.6 engines to 130,000 miles, and then taxi services buy the Crown Vics and run them for 300,000 or even 400,000.