I have an 06 lbz with afe straight pipe and intake sinister egr delete and a bully dog set on fuel Econ. Has 35 inch tires and weighs 10,000 pounds and gets 11 mpg. I put the exact same modifications on another lbz with the same weight but smaller tires resulting in 21mpg. Any thoughts on what I could be forgetting or messed up? I'm not a tool bag looking for lope tunes and black smoke I'd just like my fuel receipts to be lower haha