Help Diagnosing bad MPG
Thread Starter
Member
Joined: Nov 2010
Posts: 109
Likes: 0
From: San Francisco
2008 G55
Help Diagnosing bad MPG
I have a 2008 G55k (same engine as CL55)
Any ideas how I could diagnose low mpg? I am barely hitting 7MPG in light footed city driving. No check engine light is coming on.
I am thinking maybe its a air filter/injector issue or maybe the ecu is acting wonky. Is there a way to 'reset' the ECU so that it goes back to factory defaults?
Also was thinking perhaps the MAP sensor could be at fault- Not too familiar with these though. Are they similar to MAF's where they can be cleaned?
Thanks
Any ideas how I could diagnose low mpg? I am barely hitting 7MPG in light footed city driving. No check engine light is coming on.
I am thinking maybe its a air filter/injector issue or maybe the ecu is acting wonky. Is there a way to 'reset' the ECU so that it goes back to factory defaults?
Also was thinking perhaps the MAP sensor could be at fault- Not too familiar with these though. Are they similar to MAF's where they can be cleaned?
Thanks
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Joined: Jun 2008
Posts: 3,834
Likes: 65
From: Texas
2003 CL55
I have a 2008 G55k (same engine as CL55)
Any ideas how I could diagnose low mpg? I am barely hitting 7MPG in light footed city driving. No check engine light is coming on.
I am thinking maybe its a air filter/injector issue or maybe the ecu is acting wonky. Is there a way to 'reset' the ECU so that it goes back to factory defaults?
Also was thinking perhaps the MAP sensor could be at fault- Not too familiar with these though. Are they similar to MAF's where they can be cleaned?
Thanks
Any ideas how I could diagnose low mpg? I am barely hitting 7MPG in light footed city driving. No check engine light is coming on.
I am thinking maybe its a air filter/injector issue or maybe the ecu is acting wonky. Is there a way to 'reset' the ECU so that it goes back to factory defaults?
Also was thinking perhaps the MAP sensor could be at fault- Not too familiar with these though. Are they similar to MAF's where they can be cleaned?
Thanks
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
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Joined: Dec 2006
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From: Clifton, NJ
96 and 08 911 turbos
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Posts: 698
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From: Germany
C215 CL55 AMG, W124 500E, W210 E430, W124 300E
I have an average 11.8MPG in my CL55AMG.
I do mostly short trips with max. 1/2 throttle accelerations through traffic when needed, other than that i mostly roll with traffic. Ohh and thats with AC off. If i put on AC it goes rather about 10MPG.
If i drive in race mode, it can go up to 8.3MPG quite easily.
I thought thats normal. The handbook says here in germany 20L/100km for city driving on average. Thats 11.8MPG.
I do mostly short trips with max. 1/2 throttle accelerations through traffic when needed, other than that i mostly roll with traffic. Ohh and thats with AC off. If i put on AC it goes rather about 10MPG.
If i drive in race mode, it can go up to 8.3MPG quite easily.
I thought thats normal. The handbook says here in germany 20L/100km for city driving on average. Thats 11.8MPG.
