I own tons of 5.4L.
2 F250 2wd. Mpg was 15-16 city/hwy
#1 had 240K end replaced engine due neglected coolant ate alum head. Still running.
#2 had 200K still running in Chesterfield under new owner.
4 E350 passenger vans. Mpg was 10-18 city/hwy
#1 had 550K blew up head gasket it leak oil out. Junk it.
#2 had 230K but body rot off.
#3 had 366K but driver didn't check oil so it done.
#4 had 152K Zero problem.
1 Expedition Mpg was 14-19 city/hwy
Had 157K back in March 2013 now it had 181K so no major issues. Changed spark plugs, FLUSH cooling system it was NASTY, and new exhaust manifold with studs.
Last edited by MilwaukeeF350; September 22nd, 2013 at 10:09 PM.