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Mercedes-Benz C-Class Real World MPG

16 messages,  Last post on Oct 02, 2008 at 3:54 AM

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#14 of 16 Re: Mercedes-Benz C-Class: MPG-Real World Numbers [pf_flyer] by ajay747 Sep 21, 2008 (7:49 pm)
Replying to: pf_flyer (Jun 12, 2006 8:17 am) I am new to the board and interested in a 2009 Sport with the new 7 speed auto. Does anyone have any MPGs on the 2008 or 2009 (either automatic)?   Thanks for all the good comments on this forum. Replies to this message: trauppius (Oct 02, 2008 3:54 am)
#15 of 16 by hgiles Sep 29, 2008 (7:15 pm)
12 mpg so far. I'm not complaining though. All grins here.
#16 of 16 Re: Mercedes-Benz C-Class: MPG-Real World Numbers [ajay747] by trauppius Oct 02, 2008 (3:54 am)
Replying to: ajay747 (Sep 21, 2008 7:49 pm) I completed a 575 mile Black Forest/Alps Rally trip using my new US spec C350W. I picked up the car at the factory in Sindelfingen and was told that the Engine Control Unit (ECU) had been setup for the car to run on unleaded gas down to 87 octane. They do this because the supply of high octane unleaded is spotty in Eastern Europe. I was told that when the car arrives back in the US the MB Vehicle Processing Center will reset the ECU to run on 91 octane, and that the mileage should improve as a result.   Anyway, on the trip which combined 50 MPH back roads (30%), city (15%), and the rest on the autobahn at speeds between 75-110 MPH I was pleasantly surprised to find the mileage averaged 24.9 MPG for the entire trip and peaked at 29.2 MPG on the autobahn at about 85-90 MPH. The auto transmission was kept in Comfort mode and I avoided fast starts and high RPM (as recommended during break in).   I am leasing a Saturn Aura XR (252 HP/V6/auto) and get about 21.5 MPG in my mainly highway commute to work. I think the Benz will do better.

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