n9ssham

After dealer flash update - Poor gas mileage fixed! When I purchased my new 2015 Silverado 4x4 Extended cab a little over a year ago it got great mileage. If I drove carefully I could average over 20 mpg, but it had been gradually getting worse, and most recently I have been struggling to get 15 mpg! I blamed it on winter gas at first, but now that it is June I was beginning to wonder what happened to my truck. So I took it into the dealer today and the guy tells me that I need some firmware update to fix the "stuck in 4WD mode during cold weather" recall problem. I always keep the truck in 2WD, and I have checked the indicator and the selector switch position a million times to be sure that was not the cause of my gas mileage problems; so I know that the INDICATOR was NOT showing 4WD mode at any time. But, apparently the truck has been stuck in 4WD Auto mode without my knowledge. Hopefully it was not in FULL 4WD mode, although I think I would have noticed that! I had noticed some tire squeaking when turning on smooth concrete, but nothing like the binding and lurching I would expect from being in FULL 4WD mode. Anyway, on the trip home from the dealer it felt like I had my new truck back! The mileage on the real time indicator was pegged out most of the trip! By the time I got home (20miles), the average mileage was up to 22 mpg, with half city, half highway driving! If you haven't done this "Recall" I advise you get it done ASAP! I consider myself very fortunate that I only have 7,000 miles on the truck!