I have found over the last year that my absolute favorite time to fast is while traveling, either by car or through those awful airports.
For one — especially when on a long drive — you eliminate any sort of discomfort from whatever food might do to you gastrointsestinaly. For another, it just makes the trip easier, as you don't have to worry about when and where to eat, like, damn, wish we'd have gone there, at that exit back there. And most applicable to driving, it really shortens the trip when you don't have to stop for an hour to sit down at a restaurant to eat — since I almost never do fast food joints, even the healthier choices some now offer.
Here's a photo I snapped the other day at a refueling pit stop.
That's the line at the Subway sandwich shop inside the gas station. I note that's the big thing, now: fast food joints at all the major gas stations. You'll be better off with some nuts, jerky, or even pork rinds.
It's really mind altering, this Paelo way. It seems to far off, now, to be obsessed about food all the time. No sooner would a meal be complete and I was thinking of the next one.