Ram is 2013 CC 5.7 6 speed. I have S&B CAI, 87 TB, Catch Can, & Bully Dog Tuner set to stock as I run 87 octane. Driving from Texas to Illinois, and all highway, maybe 300lbs in the bed with 4 adults in the cab running a/c the whole trip. My first tank I got 18.1 mpg (hand Calculated) driving...