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#1
12-09-2004, 09:39 PM
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winter = worst milage?
Hi,
Lately Ive been noticing decreased fuel milage in our 95 E300D. I dont idle the car for long in the morning (up to 5 min). What can you guys tell me about the diesel fuel sold in the winter months. Do the gas stations add some anti-gel chemicals and that decreases the performance? Also, my MB car manual says that if "winter diesel" cannot be obtained during cold weather, the owner should add kerosene to the fuel tank. Can you guys educate me on winter diesel fuels.....Right now im going to hit the search buttom.... Thanks 
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#2
12-09-2004, 09:44 PM
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The fuel in the winter is definitely different than the summer fuel. When I ran the SD in the winter, the fuel economy would drop from about 28 down to about 24 or so. Now, I am running the SDL, and it can achieve 30 mpg on the summer fuel. On the past two tanks, the mileage has dropped the typical four points. It's down in the 26.5 range.
Could go 600 miles on a tank in the SDL. Now it's down to 500 miles. 
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#3
12-09-2004, 10:07 PM
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I notice the same thing too and noticed it for the last 5 years with the Jetta. Summertime in the Jetta gave me 22 km/litre, winter was always about 20 km/litre. About the same difference so far in the last few weeks with the MB. Since beginning of November I've noticed it not getting as good mileage anymore.
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1991 MB 300D 2.5 Turbo (207000km) (now gone) 1993 Audi 100 CS Quattro (300000km) 1999 VW Jetta TDI (290000km) 2002 Audi A6 3.0 Quattro (150000km) 2005 MB E320 CDI (34000km)
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#4
12-09-2004, 10:32 PM
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Don't forget it also takes the engine longer to warm to peak efficiency, so mileage will be lower even in areas like Southern California, where I'm not sure winter blends are sold.
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'91 300D 2.5 Turbo 330K '00 VW TDI Golf, 190K '67 BMW R50/2 '73 Norton Commando Interstate
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#5
12-10-2004, 01:44 PM
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Winter blends are derived mostly from blending #2 and #1 diesel(kerosene). Higher %blends of #1 will give lower milage. With my 300D I get 22mpg with flying J in the winter, but get 24 with Mobil diesel (2 cents more). Experiment with different stations in winter to see what gives best results. Remember its a balance though. More #1 will protect against jelling better if it gets below 10 degrees F at your location.
my .02
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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes 
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#6
12-10-2004, 02:52 PM
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I get 26 to 27 mpg in summer, drops to 24.5 to 25.5 in cooler weather. If I use an additive to raise the cetane a small amount the fuel economy goes up about 1 mpg in the summer and in winter.
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