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These dodge engines are grunt designed. You thought of replacing the cam is good one.
I have the 5.9 rt and nearly same gas mileage so I feel for you. My best mod was the trans.
Get a shift improver kit or such to shorten the slip time. Ive got the Mega viper trans kit installed in mine and it is like whole new truck.
I worked many similar angles to see 16mpg. this is my truck and play toy not daily driver.
So my approach was better use of fuel burned and less rotating mass etc.
I got more power and better delivery of it thus better mpg when my foot is on and off the floor.
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