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DWL within reason. Don't accelerate up hills, and if you can afford to lose a little speed on a steep ascent, do it. If you're running A/C, switch it off for ascents and on its highest setting for descents.
When you're going 75mph, your car has twice as much kinetic energy as when you're going 53mph. What this means to you: you have much more to lose when you hit the brakes. Bleed off some speed before you approach your exit. Leave enough room in front of you that traffic never causes you to hit the brakes.
Pump up the tires beforehand, apply Rain-X to your windshield so you won't need the wipers, and keep 12V loads down if it can be done conveniently. Clean the junk and unneeded tools out of your car before you go to cut down on rolling resistance.
Some of this is pretty obvious stuff that you do anyway, but there's not much else that can be done when you're constrained by time and the speed limit.
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