Scan gauge was giving too high of numbers, unless I didn't have it in the truck since the last fill up. Was around 10% too low for the fill up. Est (tire change in the middle of the tank) was 21mpg. Last few days been getting 22-24mpg to/from work according to the scan gauge. I'm wondering if the tailgate up/down rumor would prove good in my case with a shorter box, guessing not but I'm thinking about trying it for a day.
I received my new 235/85/16 tires, so they should be on the truck before long, and the scangauge will be off once again lol.
With small amount of research, posts suggest that the supercharger option for this engine increases mpg slightly (1-2 mpg claimed). Nothing special, but the extra power for the once in a while fun factor might be worth while. Down side is the rebuild every 100k miles (~4-5 years for me) but +75hp is nice
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Really need to get a notepad in the truck so I can start my fuel log.