I overinflated the tires to 50 psi (really stupid since the max psi is 35 in these things), kept the speed at 52 mph, it was a hot day, I didn't have any of the luggage in it that I would normally have since I wasn't traveling for work, I just had the engine tuned up, removed the side mirrors (just for this trip), and was being passed by alot of trucks on alligator alley.
To be honest, I'm not even sure about what make it jump so much. I have my good trips and my bad trips and my gaslog is all over the place. This one turned out to be a great trip. There was almost no city driving at all.