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  #1  
Old 01-22-2009, 01:20 PM
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Does a 1985 300sd really give 35+ mpg???

Could it be someone is lying to get more money for their car? Seems to me these cars only give about 26-28 mpg?

http://atlanta.craigslist.org/cto/1003093827.html

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  #2  
Old 01-22-2009, 01:31 PM
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Add says 20-30mpg. Sounds about right. Might be stretching it on the million mile part though.
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  #3  
Old 01-22-2009, 01:38 PM
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A 300SD gets about 19-30 mpg depending on driving conditions. Most of the time they get around 23-25ish.

Engine will last MAYBE 400-450,000 if very well maintained.
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  #4  
Old 01-22-2009, 01:56 PM
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Quote:
Originally Posted by jbach36 View Post
Could it be someone is lying to get more money for their car? Seems to me these cars only give about 26-28 mpg?

http://atlanta.craigslist.org/cto/1003093827.html
Are you kidding me???????40-50mpg minimum
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  #5  
Old 01-22-2009, 02:00 PM
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It could, but your talking some serious modifications and economical driving skills. I would believe 30 since that is what I get on the motorway around here with a 50/50 blend of biodiesel and regular diesel.
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  #6  
Old 01-22-2009, 02:06 PM
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Quote:
Originally Posted by jbach36 View Post
Could it be someone is lying to get more money for their car? Seems to me these cars only give about 26-28 mpg?
I would routinely get 30 mpg over the road in my '83 300SD at 65 mph. I checked it for years, since I drove it to 305K before selling it. 26-28 mpg would be a good city and highway combined number.

The wheels on it aren't '85, they're '84 and earlier.
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  #7  
Old 01-22-2009, 02:13 PM
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I can get 37 with 35% wmo added to fuel,however I have a different rear end,and get that at speeds over 75 mph.
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Old 01-22-2009, 02:15 PM
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Yes, they can get that high---down hill with a tail wind, in nuetral and idling. Other wise expect mid to upper 20's.
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  #9  
Old 01-22-2009, 04:30 PM
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The only time saw 30mpg on my 1981 was when it was being towed

I averaged 24.6 combined city and highway driving on an 84 mile commute (one way)

The SDL gets 27+ on the same route...
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  #10  
Old 01-22-2009, 04:57 PM
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I tend to take these reported numbers with a grain of salt especially if they are calculated using the mileage of the car's own speedo (and not a GPS etc). There's just quite a bit of variables like if the correct tire size is being used (and even worn out correct tire ain't correct any more). Another can of worms is topping up with fuel (it is not always filled up to the same level?) before zeroing the trip meter. So I am just saying that making comparisons is kinda hard (especially given different climates, driving habits, fuels etc). Of course, improving one's own readings is definitely cool (and quite real).
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  #11  
Old 01-22-2009, 04:59 PM
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But having said that... my best is 29.6 mpg on a -84 300SD (lots of highway driving and summer conditions). And I've come close to repeating it...
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  #12  
Old 01-22-2009, 05:00 PM
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I've averaged 25-26 over the past couple of years.
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  #13  
Old 01-22-2009, 05:14 PM
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to all:

i have a HEAVY foot (my usual "road speed" is about 75-80MPH on the interstate) & just returned from a >3K trip (2 weeks ago) in a '85 300SD with well over 300K on the clock.

we got 29.9MPG on the trip, so i'd guess that with REALLY careful driving that you COULD get 35MPG.

otoh, i don't have the patience to do it! nearly 30MPG works for me.

yours, texasnative46
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  #14  
Old 01-22-2009, 05:14 PM
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Quote:
Originally Posted by Skid Row Joe View Post
The wheels on it aren't '85, they're '84 and earlier.
Actually, they're 1985 and earlier.
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  #15  
Old 01-22-2009, 05:21 PM
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I average 20-26 MPG Best i ever had 28 MPG...Man...I really need to buy another injector , last one is leaking even with the fuel line replaced...

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