I recently replaced the DIM (digital information module) on my 2003 Volvo XC70 Cross Country at 113500 miles. As you know the DIM has a message window that posts MPG, Average Speed, Miles left to and empty tank, etc. The average MPG before replacing the DIM was 20 +/- MPG city driving and 25 +/- MPG on the highway. The current MPG city driving is down to 15.5 MPG. I have questions:
- Does the DIM have to be readjusted somehow?
- How do I confirm it is the DIM? Do I reset the message window by driving a combo of city and highway driving or do I need to bring the car in for Oil/Filter change, which was recently done at 110,000 miles?
- I am currently monitoring the gas mileage for the next time at the pump, is this the right way to monitor the situation?