Well ;
As mentioned many times here , the speed at which you run your W-123 has everything to do with it .
As our 300,000 + mile 240D routinely gets 30 + MPG's across the Desert fully loaded & with the AC on ,I know this is because I simply WILL NOT exceed 60 MPH .
Tom's W-126 , he holds it to 60 MPH and it returns 30 + MPG's fully loaded , like a TRUCK loaded .
-Nate
Henry Said :
>
> well said, Tom............I thought Reagan said that, though?
>
> I'd say 30 ish is on average, the best for these cars. Yeah, I've gotten up
> to 34, in perfect conditions with my SDL.
> And, it's interesting, when people are checking mileage:
> some, fill the tank to the top, when starting, and, just till it "clicks
> off" when refilling. then check the mileage.
> Air trapped in the tank can make a difference, at times, too.
> I do note my SDL gets better mileage below 70 than above, with the best I've
> done (except for the 34 mpg day) at around 62 mph.
> The 34 mpg day was across AZ, on a perfect cool spring day, windows up, no
> A/C, and a prevailing, fairly strong tail wind.
> so, other than a "best" for me, not a usable figure.
> But, I've often gotten 29-32 going up and down I-5, or to SLC.
>
> Henry
>
>
> ----- Original Message -----
> From: <audiolaw@...>
> To: <diesel_mercedes@yahoogroups.com>
> Sent: Friday, June 17, 2011 8:24 AM
> Subject: Re: [diesel_mercedes] 350 SD Mileage
>
>
> >I just rolled over 350,000 mi. on my way to Court on Tuesday! '81 300SD.
> >
> > I keep a three drawer toolbox and various other tools, spares, case of
> > oil, some camping supplies in the trunk. So no lack of weight. I add
> > almost 300 lbs each time I sit in the car.
> >
> > Regularly hover around 26-27 mpg in city driving, drift up to 29 on
> > freeways. When we hit the road for a long trip, the mileage will get up
> > over
> > 30 and even over 31 sometimes.
> >
> > I know people who swear that they get 40+ mpg on their 123 cars, which
> > are MUCH less aerodynamic than the 126s. I know people who swear that
> > they get mid-20s on their Ford and GM V8 diesel pick-up trucks. I know
> > people
> > regularly see leprauchans on their way home from the bar, late on Friday
> > or Saturday nights. I know people who swear that they know that
> > dinosaurs
> > and men populated the earth at the same time.
> >
> > I believe that progress happens, and that modern diesels are more
> > efficient than our old ones. Does that mean that I believe that a 350 SD
> > regularly gets 35 mpg? Remember what Teddy Roosevelt said: Trust but
> > verify.
> >
> >
> >
> >
> >
> > In a message dated 6/17/2011 5:42:03 A.M. Pacific Daylight Time,
> > mahatmakanejeeves@... writes:
> >
> > A couple days ago a member posted that he calculated 30+ MPG for a 350SD.
> > I have a '91 short body; my mileage on long-distance road trips rarely
> > exceeds 26 mpg. That's at 5 mph over freeway speed limit, steady state
> > with
> > cruise control, for thousand+ miles. My calculation spans several fill
> > ups,
> > which compensates for variable top offs at intervening stops.
> >
> > My '81 300SD rarely exceeds 27 mpg, same conditions.
> >
> > I've noticed a roughly +3% calibration error to both cars' speedometers
> > compared to GPS, so my MPG is overstated by a like amount.
> >
> > How on earth would I get 20-40% additional mileage? Two answers obvious
> > to
> > me are: shed excess weight (like gutting the interior) and reduce rolling
> > resistence (running on high-pressure, skinny tires). Oh, and setting the
> > cruise for 40 mph for lower drag.
> >
> > Is my car flagrantly out of tune on fuel/air mixture? I don't have soot
> > belching out the tailpipe...
> >
> > The car's PO had the notorious 3.5 L diesel replaced courtesy of Benz,
> > thank you very much. But I assume the fuel injection has 189K chassis
> > miles on
> > it and I've never touched it.
> >
> > MKJ
> >
> >
> >
>
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