S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Gas Consumption

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Old Mar 11, 2007 | 11:00 PM
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Mb56091's Avatar
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1985 Mercedes 380se
Question Gas Consumption

I am wondering about the gas comsumption of the 380se for 1984. I found it stated at 18/23 but when i look at the 85 its 16/18. Is this true. If not what is? Is there a difference between the 1984 380se to the 1985 380se
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Old Mar 13, 2007 | 09:27 PM
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I think it might be more of a typo error than anything else. I have a 84 380sl and I get about 18/23 mpg. I also have a 88 420sel and I get the 16/18 mpg.
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Old Mar 13, 2007 | 11:02 PM
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2006 E320 CDi, 2008 3/4 Ton Suburban, 2007 "rice rickshaw" Accord 5 speed
gas W126 cars

Originally Posted by Mb56091
I am wondering about the gas comsumption of the 380se for 1984. I found it stated at 18/23 but when i look at the 85 its 16/18. Is this true. If not what is? Is there a difference between the 1984 380se to the 1985 380se
Gas mileage is never a strong point for an S-Class of any vintage. The W126 is no exception.

I get 13 mpg city and 18 mpg highway. With the a/c on the mileage is a couple of mpg less.

It is a luxury car, not an econo-box.
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Old Mar 14, 2007 | 03:06 AM
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c43
get some high flow cats and intake, that will help get you better mpg. Also make sure your o2s are good, and a fuel system cleaner would not hurt. Might also want to check air filter.
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Old Mar 14, 2007 | 10:30 AM
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2006 E320 CDi, 2008 3/4 Ton Suburban, 2007 "rice rickshaw" Accord 5 speed
happy with mileage

Originally Posted by Ashkan's C280
get some high flow cats and intake, that will help get you better mpg. Also make sure your o2s are good, and a fuel system cleaner would not hurt. Might also want to check air filter.
I had the 2 resonators removed and thought about a high flow cat. However I think the headers are the most restrictive and should be replaced first. The intake is very good already and I do not want to mess with it.

I tried a K & N filter without noticeable difference. I also tried Platinum 4 spark plugs.

The car is like a big rear drive Chevy of years past. Very comfortable and easy to maintain. All it takes is money and tender loving care.
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Old Mar 14, 2007 | 12:05 PM
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c43
a better designed exhaust system and intake will improve mpg, might want to check the mas to see if its on its way out. You could also try removing excess items from your car. If you have a lot of junk in there. Try the first gear start mod, that will also help get better mpg
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