[Brian R.]

From response to PM:
Did you have a previous problem with the head gasket? You say you had an apppointment to get it taken care of. If not, then yes, the head gasket could definitely have caused the problem, considering that you observed burning antifreeze just before the engine let go. Sounds like your head gasket gave way and your engine couldn't run at highway speeds with what antifreeze was in the engine oil. There should be antifreeze all in your exhaust system to prove your contention that the engine was burning antifreeze before it died. This is proof that the head gasket was the problem that caused your engine to give out.