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Old 01-29-2008, 08:23 PM
TTCummins's Avatar
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Join Date: Dec 2006
Location: Ypsilanti, Michigan
Posts: 240
Question Gradually Increasing MPG

As I have been able to repair more and more things on my 300D I have been driving it more. When I picked the car up it was getting a pretty miserable 19 MPG. This last week I put 700 miles on the old girl and it eeked out about 25 MPG more or less the same driving type and breakdown (city/hwy). How about the rest of you guys out there that have brought back some of the luster of your cars. Have you noticed an increasing MPG while dusting off the mothballs?

2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.
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Old 01-29-2008, 08:43 PM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
You may still do a little better on summer fuel later this year. You are probably already pretty good for this time of year. Unless you read ebay that is.
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Old 01-30-2008, 05:27 AM
Posts: n/a

I used to get 22mpg average in the summer but in the last year I have managed to increase my efficiency up to 27mpg average. However, it sank to 24.75mpg when I switched to winterized fuel.
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Old 01-30-2008, 11:38 AM
ConnClark's Avatar
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Join Date: Nov 2005
Posts: 1,121
My Kalifornistani 300SD used to get 23mpg all highway miles at best. Then I got the trap ox recall work done which gave me the ability to get 26mpg. I replaced the stock muffler and maybe got like 1/4 to 1/2 a mpg more. Changing my turbo's compressor wheel got me another 1/2 a mpg more on the highway.
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)
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Old 01-30-2008, 01:24 PM
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Join Date: Sep 2007
Location: Redmond, WA
Posts: 622
I've got myself an '83 240D Auto which has increased MPG over the time I've owned it, but that's because I've been fixing it :p

Started off around 15 mpg, terrible. Replaced air filter, fuel filters and got up to about 17. Fixed vacuum problem causing trans to shift very late (engine rev very high burning more fuel) and got up to around 20. Valve adjustment, now up to about 24-25.

Supposedly it can go higher, but I'm really at a loss as to how. Maybe fuel injectors?
1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
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Old 01-30-2008, 03:23 PM
Magoo's Avatar
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Join Date: Oct 2006
Location: Pennsylvania
Posts: 333
28 in the summer, 25 in winter, mostly highway.

'83 300D Turrrbo 295K miles
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