If you're on flat roads, cruise is ok, but keep an eye on the tach - if it flexs a lot, you'll need to feather the pedal yourself. I've done 500 mile trips (each way - another planned this weekend) and have run the a/c on recirc, low fan and no c/c and gotten 38 mpg. (NJ turnpike, DL and MD - fairly flat roads) Once I got back to the hills of New England I lost a bit but still came out with great numbers. Stay at a constant speed and you'll do well.

C&J the Gas Pirates

I'm the Captain of this ship and I have my wife's permission to say so.