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Sounds like what happened to me a few weeks ago. Running smooth at 55 and quit dead with no warning at all. No restart. Had to be towed also.
turned out to be FICM (fuel injection control module).
If that turns out to be your problem it's an expensive repair if you're out of warranty, but it's covered by the emissions warranty. Don't let the dealer try to tell you otherwise.
Check recent threads here for detailed discussions of the warranty question, and for an easy repair you can do yourself on the FICM if you're not covered for some reason.
I got through the whole process unscathed, largely because of help from several guys here.
05 F350 XLT Shortbed Crew 4WD, handshaker, stock