Yea, I feel ya! I am at 9.7 currently because I gave up even trying to improve it. Changed the center display over so it shows the torque output because that's a fun one to watch. It's my "aggression" meter

Only time the truck gets back into double digit MPG is when the wife takes it to work for the day, and then its game on to see how fast I can get it back to my previous average.
Local SAMS is typically between 40-50 cents / gallon less for 93 octane than any other gas station around here. Well worth the cost of annual membership when I average a fill up every 4 days.