I know I saw a few threads when I googled this, but can't find them here, so pardon this newb....
I bought a used (20,000 miles) 2012 LT A/T. I've put 5000 miles on it in the 6 weeks I've owned it, & the best mileage I've gotten so far is 34.1, but I'm averaging 32.9 (DIC says 35.1 avg over last 3000 miles, but that issue isn't as important to me), and I drive 90% hwy, and about 70% of that is @ 60 mph. I realize the winter fuel blend here in OR/SW WA is a lot worse than the advertised 10% ethanol, but that is still a far cry from the 38 advertised.
I also have not been able to put more than 9.9 gallons in the tank (OR they pump for you, but I've tried a few times myself in WA with no better luck), and I believe this is supposed to be a 15.6 gallon tank!
Any advise on improving my mileage or filling my tank to somewhere near capacity? I don't like filling up every 2 1/2 days (as I drive 130 round trip for work every day)!