Really? 25 with Grabbers and some traffic and 75mph. Are you in a CRD? Was there a really strong tail wind? I've been keeping track of my gas for the last 11 tanks and I haven't had a tank over 19 yet. I base it on the gal filled / the miles driven. The overhead computer is always higher than what the actual math gives me.
That's great if you're really getting that, I wish I could. if you want to keep track of your fill ups check out
www.gassavers.org which I have been using. And hopefully you'll make it to The Pine Barrens this weekend.