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big mpg loss on my 2012 c250

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Old 02-02-2020, 04:37 PM
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2012 c250
big mpg loss on my 2012 c250

At 70,000 miles i was getting 25mpg overall.
At 104,000 miles i'm now getting 17mpg.
Basically the same driving style now as then, same mix of town and highway driving.
I've been doing regular oil and filter changes every 10,000 miles.
I've changed the transmission fluid and filter.
I've changed air filter per schedule.
I had a tuneup recently (had spark plugs changed)
Tires are in good shape and have proper air pressure.
My mechanic is mystified as to the mpg loss.

Please help with any suggestions on what might be wrong.

Old 02-03-2020, 10:23 PM
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2016 C 300 4matic Lunar blue
Are you actually calculating the mpg, or relying on the computer?
Old 02-03-2020, 11:15 PM
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2016 C300 4Matic traded in for a 2022 E450 Coupe
Originally Posted by chemong
At 70,000 miles i was getting 25mpg overall.
At 104,000 miles i'm now getting 17mpg.
Basically the same driving style now as then, same mix of town and highway driving.
I've been doing regular oil and filter changes every 10,000 miles.
I've changed the transmission fluid and filter.
I've changed air filter per schedule.
I had a tuneup recently (had spark plugs changed)
Tires are in good shape and have proper air pressure.
My mechanic is mystified as to the mpg loss.

Please help with any suggestions on what might be wrong.
tell us how you calculate the mpg.
Old 02-04-2020, 02:02 PM
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2015 C300 4Matic Sport

Old 02-09-2020, 12:54 PM
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2018 C43
Do a tune up and clean the intake valves.

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