I'm with @
Davidx and @
Tcoat on this one. Unless you have too many cars to drive there or some other such circumstance, gas 'er up and enjoy the trip. Pick some non-highway stretches, only eat at local restaurants and make an adventure out of it.
Of course, keep in mind during the month of June I put over 4,700 miles on my FRS, so this trip is nothing. Heck, I'm ready to go now.