Welcome to another Missourian, I have a 68 mile round trip drive, mostly highway as yours is about to be. Without aero mods on a 2003 zx2 I am averaging over 40 by just changing driving habits. On windy Missouri days, tuck in behind a slower SUV, semi or if lucky a fed ex truck.
As others have said rotate and balance tires, make sure your alignment is spot on. Bad alignment eats tires and hurts fuel economy. My tires are rated at 44lbs so I run 40lbs cold, when they warm up they are around 44.
Most on here swear by scan gauge, I have an UltraGauge and love it. I made big time gains with it.
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