Maligator

I've had this problem since the recall/update was done. 2020 2500 and I've had it at the dealership at least 3 times to be checked. I've noticed city driving to be around 15-16 and highway around 18. Previously I was getting around 18 city and 20-23 highway depending on road/driving conditions. I also now get an average of about 9 when towing my 32' 10K lb 5th wheel. I've also really noticed how little DEF seems to be used since this was done. GM has been involved recently and it appears that they are acknowledging a problem. They said that a new update has to be pushed out, but they can't say when that will be. Who knows if this is BS or not, but I'm probably going to start a lemon law claim. Anybody else noticing the DEF consumption?