I took my 135i in for cracked 3rd brake light and fuel injector check TSB’s last Tuesday and immediately noticed a 4 mpg drop in as mileage. I pretty much drive my 135i to work and back and would get 22 mpg solid. Now I am getting 18 mpg. I have a really good relationship with the dealer so I will call them Monday and see what they say. I need to look at my documentation I got after the work to see if it is new SW version or just a reprogram but they did tell me they would have to reprogram after the work.
2015 M235i - Estoril Blue - 6 speed - Black Lather - Cold Weather Package - Premium Package - Harmon/Kardon Premium sound