Mercedes Benz w123 and w115 fuel mileage - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 11-05-2014, 11:38 AM Thread Starter
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Mercedes Benz w123 and w115 fuel mileage

I am interested in any one of these two cars i.e. a w123 200d or a w115 200d. I have been reading on several sites that the w123 200d can average 39mpg and the w115 can average 38mpg. Is this true, or are these people being too optimistic? If so what is the average mpg that I should expect? Mind you, I am speaking about the european version of these cars.

Thanks Much.
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post #2 of 8 (permalink) Old 11-06-2014, 05:37 AM
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Mercedes Benz w123 and w115 fuel mileage

Too optimistic I think. I do think the diesels will consistently bring over 20mpg. 25 is probably realistic on what I've read. Yes, people report over 30 all the time, and I don't think they are lying about highway mpg. I had a 1982 Isuzu Pup diesel long bed that I'm pretty confident gave me 30-35 mpg highway. (Edit: 4-cyl. 0-60 took about 60+ seconds. It often struggled to keep up with traffic or even maintain a speed over 55 when going uphill on a highway. Blew nice big plumes of carbon soot when I smashed the gas pedal.). So it can happen, but I think it's all about the way you drive it.

I've never owned a Benz diesel. I do think about it though.

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Last edited by Fonzi; 11-06-2014 at 07:23 AM.
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post #3 of 8 (permalink) Old 11-06-2014, 07:13 AM
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I would wonder if the speedometer / odometer are overly optimistic. I have never believed listings that show diesel MBs getting 40 mpg. I suppose it's possible.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
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post #4 of 8 (permalink) Old 11-07-2014, 07:35 AM Thread Starter
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So is it impossible to reach that mileage? I am asking again just because I am frequently seeing this information on various websites, not just from people who want to sell.
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post #5 of 8 (permalink) Old 11-07-2014, 08:35 AM
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Originally Posted by GCas View Post
So is it impossible to reach that mileage? I am asking again just because I am frequently seeing this information on various websites, not just from people who want to sell.

I do think it is possible, especially when driving downhill with the wind to your back and a very well tuned diesel. But you should set your expectations at a more realistic number so you are not disappointed if you don't achieve them. Go ahead and make it your goal to somehow burn a full or even partial tank at 40 mpg, but be pleased if you ever top 30 on your mission. That's my advice.

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post #6 of 8 (permalink) Old 11-07-2014, 05:35 PM
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Way too optimistic.

I've never had a W115 diesel, but I can assure you that a W123 diesel is never going to get 39 mpg.

In a mixed city/highway cycle you will probably average in the mid to low 20s. Burn a whole tank on a fairly flat highway run and you could approach the low 30s, but will probably end up in the high 20s.

The claims you see about mileage for some of these are grossly overstated, and when I have seen them, I ask the seller for proof....

W115 and W123 gassers are far worse.

Dan
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post #7 of 8 (permalink) Old 11-08-2014, 09:28 AM
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Then there is the matter of the top speed being about 52mph giving one the illusion that fine Minnesota molasses flowing uphill in mid-January is doing over Mach 2. To say nothing of the very newest W115 now being 38 years old with the newest W123 a decade younger.

In general, I find the idea of buying a classic for fuel economy (real or imagined) about as dubious as for a guy trying to date Portia DeRossi. Theoretically possible, but the results seem uncertain.
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post #8 of 8 (permalink) Old 11-26-2014, 04:13 PM
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I have a 1971 220d. On the way home from the purchase I noted the odometer was a little optimistic. I don't know how much maybe 5%? One tank averaged 41 mpg on the way home.

Most tanks since were 33-36 mpg. I got the valves adjusted and it slipped closer to 33. Part of this drop may have been an oil use issue- that has since been cleared up.

I have not seen a tank below 33mpg. I have owned it over a year and it is a daily driver.

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