Do all the stuff everyone has suggested, especially higher tire pressures and keeping your speed down.
In addition, why not do something to lower your coefficient of drag? Get a little duct tape and close off 3/4s of that upper grille area, some of the lower, and even the area between the top of the bumper and the grille and headlights.
Watch your temp guage and as long as you're not in warmer than usual weather and/or working the engine too hard, you will probably be fine.
Could be a conversation starter at fill up time, too.
