1993 Aerostar just turned over 345,000 miles on original 3.0 engine and original A4LD transmission. Still get 23 miles per gallon. Only things replaced have been consumables like tires, alternator, oil, gas, spark plugs, and the like. Nothing major.
This is my second Aero. Am currently looking for my 3rd just in case this one decides it is time to die.