BenzWorld Junior Member
Date registered: May 2009
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New Member - why bad mileage on GL320 CDI?
Hi - I have purchased a used 2008 GL320 CDI from CarMax with 17K mi on the odometer. I am getting very bad mileage even with a VERY light foot on the pedal. My mileage is currently 12 city / 17 hwy. I don't expect to get factory claims of 17 city / 21 hwy but my current mileage is worse than a GL450. Anyone have any idea what would be causing this other than dirty air filter, nonaligned tires, low tire pressure all of which check out fine? I have the option of returning the car to CarMax by 5/17. Unless I can fix the mileage problem I plan on returning the car and replacing it with a GL450. The CarFax report for the car shows that the car was taken out of the country for a short period of time and I worry that there is something materially wrong with the car that my local Mercedes dealership isnt picking up on (the car passed a prepurchase inspection at the MB dealer and the dealer doesnt have a clue why mileage is so low). Thanks - David