Would you be able to
Would you be able to review you last service invoice? Can you verify that they used 0W20 oil as they were supposed to?
Such a loss in mileage after the first service is often due to the dealer using a different oil grade. Unfortunately, there have also been dealerships that record the correct information but do something else entirely. At first, the best suggestion I can give is to observe them carefully and ask questions. If you are not comfortable with the dealership I suggest you start servicing your vehicle at an alternate location.
Also, would you be able to give us more details. For instance:
-Traffic patterns you drive in (proportion of highway vs city)
-Weather and temperatures in your area
-Your tire pressures
-Anything else like (warm-up idling in colder days).
I can relate to Gman, as I
I can relate to Gman, as I am driving a 2006 HCH and getting very low gas mileage. It has dropped significantly since the first service, and even worse after the second service. I drive using the gauges, as I tend to be a perfectionist. I use Neutral going down-hill, use Cruise on highways, rarely have the vent turned on the windsheld to avoid emissions in the city. I have had a service done recently and still no change. I'm at a loss here, don't know where to turn. My car is not doing what it was promised to do.
I would ask you the
I would ask you the same questions I asked Ann716.
Can you give us more information?