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2003 G500; 2002 CLK55; 2007 R320; 1981 380Sl; 1987 911 Cab
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Discussion Starter #1
Recently bought wife unit a 2007 R320 with 37000 miles on it.

I have put now a 1000 miles back and forth on the Highway averaging 81 mph per cruise control at 2400 rpms.

To date, I have not been able to get the mpg above 23.7

I am running the AC expressway so road is flat.

I am getting D service needed in 500 miles (not quite sure what D service is)

Is it possible the air filters or something else is causing the low mpg? I was really expecting to be getting around 28 on the highway.

Any thoughts?
 

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96 Posts
I get up to 24 mpg on my R350 from NY to Boston. However, my average speed is less than 81 mph. I bet my consumption would be more if I do that.
 

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06 R360, 06 F350 6.0, 04 CayenneS, 96 911TT 500HP, 86 928S, 74 911S, 73 914-4, 70 914-6, 02 Durrango
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Mine is listed in my sig.
 

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06 R360, 06 F350 6.0, 04 CayenneS, 96 911TT 500HP, 86 928S, 74 911S, 73 914-4, 70 914-6, 02 Durrango
Joined
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301 Posts
Recently bought wife unit a 2007 R320 with 37000 miles on it.

I have put now a 1000 miles back and forth on the Highway averaging 81 mph per cruise control at 2400 rpms.

To date, I have not been able to get the mpg above 23.7

I am running the AC expressway so road is flat.

I am getting D service needed in 500 miles (not quite sure what D service is)

Is it possible the air filters or something else is causing the low mpg? I was really expecting to be getting around 28 on the highway.

Any thoughts?
What is the maintenance that has been performed and what are the intervals that you do? air filters, eng oil and filter, trans oil and filter.....
 

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If you are going off the computer, I would calculate it manually from the odometer. My car shows about the same that yours does driving about the same speed, but I get 25+ mpg if I divide miles driven by gallons on fill up.
 

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'07 GL320CDI
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You're getting expected mileage for the speed you're driving.

Note that aerodynamic drag increases with the square of velocity ... meaning mileage will drop exponentially with increase in speed.

The EPA figures of course are not calculated for your speed.
 
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