Big thank you to all those who mailed with help and ideas on my gas
cap stupidity.  Especially big thanks to Geo for the tip that, even
though the dweebie on the phone may say they don't have a cap, they
probably do.  Case in point - called an Autozone, heard the person on
the other end of the phone actively typing into the computer, and got
the "Nope, don't have one."  Today, at the exact same store, I went
in, and a different person pulled it up, and I got a nice, mostly
original looking gas cap for $8.  Not a locking one, but I am not too
worried about that (yet).

What a great community this list has created.  Here's hoping the trip
I start tomorrow goes well.

David.