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  #16  
Old 11-11-2009, 11:37 AM
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My neighbor is an O/O

He said some old truckers told him that any time they have to get fuel in colder areas using 'winter blend' they add fresh hub oil to the fuel. He hasn't tried it but he's considering two stroke oil. I think the rule of thumb is one gallon oil per 100 of fuel.

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  #17  
Old 11-11-2009, 12:16 PM
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OKYOURABEAST -

I'm talking about highway driving in both cases. 70-72 mph... But you make a good point in that there was extra weight (passengers, gear) when on some of the trips to New England...

Can't beat a good education, I always say...
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  #18  
Old 11-11-2009, 12:33 PM
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How about colder air being denser? Therefore being harder to push out of the way at 70+ MPH.
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  #19  
Old 11-11-2009, 12:44 PM
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The Shell station around the corner from me boasts that they treat their diesel with powerservice Nov-March. Guess I don't need to haul the jug around in my trunk anymore.
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  #20  
Old 11-11-2009, 12:45 PM
Craig
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Originally Posted by NY300SD View Post
How about colder air being denser? Therefore being harder to push out of the way at 70+ MPH.
I think that would be a small affect, and the denser air should actually help the engine efficiency.
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  #21  
Old 11-11-2009, 12:56 PM
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Winter diesel is going to give less MPG, but your speedo must be off, no way getting 33mpg out of a 617 unless its all downhill and your doing 45mph.
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  #22  
Old 11-11-2009, 01:40 PM
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Quote:
Originally Posted by Craig View Post
Well, 25 mpg sounds like the low end of normal and 33 sounds too high, regardless of fuel blend. I don't see a fuel blend resulting in a 25% difference.
Greenwich, CT to UPenn, Philly, mostly highway 80 mph. Yes, I calculate mileage on the tripometer divided by galllons refilled to full. Yes, I was surprised by the 33mph but during mixed city/ highway, I was getting 28 this summer. My 83 300D is in great shape with only 115K miles on her and I am the 2nd owner. It has new tires from PO.
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  #23  
Old 11-11-2009, 01:44 PM
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Personally I see more of a change in MPG based on topagraphy traveled, elevation, load & tire pressure and a switch to snow tires than I do with a seasonal change in the fuel blend during highway driving.

Cold air is more dense and the engine produces more power with a cold air charge that is why a turbo vehicle has an intercooler. Some Bonneville racers have that intercooler packed in ice for that reason.

Diesels take longer to warm up during the winter and it is during that longer warm up period that the engine is the least efficient. Cold oil and other fluids are just not condusive to high MPG especially on short trips even on the highway.
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  #24  
Old 11-11-2009, 02:01 PM
Craig
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Originally Posted by edge View Post
Greenwich, CT to UPenn, Philly, mostly highway 80 mph. Yes, I calculate mileage on the tripometer divided by galllons refilled to full. Yes, I was surprised by the 33mph but during mixed city/ highway, I was getting 28 this summer. My 83 300D is in great shape with only 115K miles on her and I am the 2nd owner. It has new tires from PO.
Sorry, but I don't think 33 mpg is correct for any 617, especially not at 80 mph. I would check the odometer calibration.
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  #25  
Old 11-11-2009, 03:45 PM
92 300D 2.5L OBK #59
 
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By the numbers... BTU Content.

Diesel 138,700
kerosene 135,000
BioDiesel 126,200
Vegetable oil 123,143

Why shouldn’t I just use Diesel Fuel No. 1?
While Diesel Fuel No. 1 has an advantage in low temperature operability, there are some disadvantages, as well. The energy content of Diesel Fuel No. 1 is about 95% that of Diesel Fuel No. 2 and will provide a correspondingly lower fuel economy. Diesel Fuel No. 1 is also lower in viscosity and provides less lubrication for the fuel pump and fuel distributor.

Interesting reading: http://www.exxon.com/USA-English/GFM/Products_Services/Fuels/Diesel_Fuels_FAQ.asp
http://www.biodiesel.org/pdf_files/fuelfactsheets/BTU_Content_Final_Oct2005.pdf
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  #26  
Old 11-11-2009, 04:43 PM
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Energy content per weight is the same between gasoline (octane) and diesel (cetane) the difference is density. We buy fuel by volume not weight hence diesel has advantage over gasoline since it is denser. 1 gal of diesel weighs more than 1 gal kerosene and kero wieghs more than 1 gal gasoline.

If you think winter diesel is bad try winter gasoline with all the half burnt fuel (alcohol and other oxygenates).
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  #27  
Old 11-11-2009, 06:57 PM
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Quote:
Originally Posted by bobodaclown View Post
By the numbers... BTU Content.

Diesel 138,700
kerosene 135,000
BioDiesel 126,200
Vegetable oil 123,143

Why shouldn’t I just use Diesel Fuel No. 1?
While Diesel Fuel No. 1 has an advantage in low temperature operability, there are some disadvantages, as well. The energy content of Diesel Fuel No. 1 is about 95% that of Diesel Fuel No. 2 and will provide a correspondingly lower fuel economy. Diesel Fuel No. 1 is also lower in viscosity and provides less lubrication for the fuel pump and fuel distributor.

Interesting reading: http://www.exxon.com/USA-English/GFM/Products_Services/Fuels/Diesel_Fuels_FAQ.asp
http://www.biodiesel.org/pdf_files/fuelfactsheets/BTU_Content_Final_Oct2005.pdf

Good info thanks ! I've seen these cars get 40 to 50 mpg...........................................Craigslist and ebay!!
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  #28  
Old 11-11-2009, 08:56 PM
Craig
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FWIW, those values appear to be BTU/gallon (higher heating values). I hate it when people don't use units (partial credit).
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  #29  
Old 11-12-2009, 10:32 AM
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What? 33mpg???

Quote:
Originally Posted by edge View Post
I calculated recently that I got 25mph on the hioghway whereas over the summer the same trip to Philly from CT was giving me 33mph. What gives, is diesel blended differently for the cold months?
What 300d gets 33mpg?? A 1983 300d is it turbo? Did someone do a trick 5 speed conversion?? My 1985 300d I hit once 26mpg and averages 24mpg and I was told that this model had the best rear end gear ratio for mpg!
I only WISH I could hit 33mpg! I'm running 33% B-99/66% Veggie here in Florida in my 1985 300D. This is the first snap of cold weather this year. 50's outside. Other than starting a lil rough it still runs fine! I've been told that the locals run 10% regular unleaded/90% Veggie in the winter. I have not tried this as of yet.
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Last edited by Hip001; 11-12-2009 at 01:27 PM.
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  #30  
Old 11-12-2009, 10:42 AM
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Quote:
Originally Posted by Craig View Post
FWIW, those values appear to be BTU/gallon (higher heating values). I hate it when people don't use units (partial credit).
The science teacher in me 100% agrees with you. A label is as important, if not more important than the number itself.

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