Ascii? Lets do Old School. Use the numbers on the phone pad and covert to words. Too lazy? Use this one:
http://phonespell.org/
we-at-I-90-a-eta-09
It's clear, Frank is on the road looking for Corn Dogs. He's on I90, his ETA back is on the 9th.
But as with all clues, it's not much of a help, since I90 runs from Seattle to Boston. Coast to Coast. Oh wait is Coast to Coast a clue? Or I90 the clue since it goes past Cambridge in Boston, and there is a Cambridge in England that would have been there in medieval times?