Just picked up my custom ordered 2018 340i GT last week after waiting for nearly three months and it has 10 miles on it. I've put another 50 miles since, mostly city driving, and the Onboard trip indicator is showing that my average mileage is somewhere between 14-15 MPG. This is way worse than the 20-29 the sticker says it should have. Does anyone have similar experience or do I need to drive a couple hundred more miles before I can have a meaningful MPG reading? I had a 2010 E60 for eight years and that car with less hp does about 21mpg.