Thanks. I think the transmission takes some time to "learn" so maybe that has something to do with it? I had the same engine in my 2018 GC and always averaged at least 16mpg with the same drive that is only getting 13 in the GCL.I'm at almost 3K miles. Mostly shorter drives around 15 minutes but not always just stop & go. Only getting about 14 MPG which is very low. I watched a review where somebody said it improved after 3 K miles. I got 15 MPG for the same kind of drive on my 523 HP BMW X7 so if I sacrifice on power, I certainly expect a better gas mileage in return. I will ask the service department on Wednesday.