SciRunner said:All this talk about drafting makes me want to watch NASCAR.
#84 Camry/#00 Tundra Rulez!
Even Steven said:The only thing that will be cost effective on your list is to air the tires up. I doubt you'll realize a return on your investment for any of the other things. If you need new plugs, then by all means get them, but don't switch them out just in the hopes of getting better fuel economy during your trip. You'll never recover the cost in a 3,000 mile trip!