Thank you! But sadly, it was not to be... crossing the plains of Kansas, the head/cross winds were fierce, gusting up to 40mph according to the weather report... yikes! Then by the time we hit Missouri's rolling hills, I was too tired to take advantage of them... both sapped the FE until I was down to 64mpg by the time I filled up.
Two days of no driving, then I'll be heading back home and making another attempt.