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  #1  
Old 10-20-2005, 05:57 PM
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Biodiesel = loss of mileage?

1992 300D 2.5 turbo. My father bought one. He went to bio diesel and it cut the smoke dramatically.

He went from about 400 miles per tankful to 250 miles per tankful.

Anyone? Fuel filters have not been replaced since the switch. Could the injectors be the problem?
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  #2  
Old 10-20-2005, 06:24 PM
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More information? B100 or B5? Diesel fuel varies greatly, winter fuel is cut with kerosene and has less energy in it.

Biodiesel also has less energy in it, but going from straight diesel to B100 my mileage drops 2-3 mpg, about 10%. A mileage drop of over 35% is not just due to biodiesel, especially if it is blended in diesel. When I ran B20, I had ZERO mileage drop from straight diesel.
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Old 10-20-2005, 06:37 PM
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I know my wife's 2003 Jetta TDi has run at least as well on B20 as straight diesel. However, my understanding is that many of the older cars aren't set up to run on bio and it can deteriorate some (rubber, plastic) engine components, etc. So bio might not be the best fuel for your dad's car until such components are replaced with newer models.
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Old 10-20-2005, 07:43 PM
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I would replace the fuel filters. Check to see if the fuel lines are leaking, granted you would have to be lossing a lot of fuel to loose that many miles, but it wouldn't hurt to check. Although with a 92 I don't think the hoses will be a problem, but I am not sure exactly MB changed from the old rubber hoses.

How many gallons of BD has been put through it?
Did the driving change at all? From all highway to all city or something similar?
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Old 10-20-2005, 07:46 PM
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I actually got better milage with B20 than pure dino.....never had an opportunity to see how higher percentage mixes do yet. No local souces.....need to get that processor built.
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Old 10-20-2005, 11:07 PM
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Other that a leak is there another reason for the loss of mies?

Injectors

Fuel filters

Injection pump

Turbo

exhaust

Etc.

2% or 3% we can live with but a 45% loss?

Thank you
Nick
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  #7  
Old 10-20-2005, 11:20 PM
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Quote:
Originally Posted by boneheaddoctor
I actually got better milage with B20 than pure dino.....never had an opportunity to see how higher percentage mixes do yet. No local souces.....need to get that processor built.
I'm not sure that is totally accurate. You see, you can get B20 but what is the 80% made of? I got pure dino to compare and with most I get about 600 miles on a tank. With Woodman's diesel the best I got was 540 miles. That is comparing dino with dino. My point is that since you have B20, you don't know where the 80% came from. In your case, you could have biodiesel mixed with really good diesel vs 100% dino of average stuff.

I used straight diesel and mixed B100 in it to get varying mixes of Biodiesel and I run the tank almost dry. I found that keeping the dino diesel consistant I actually lost a couple of mpg.
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  #8  
Old 10-21-2005, 09:00 AM
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Quote:
Originally Posted by aklim
I'm not sure that is totally accurate. You see, you can get B20 but what is the 80% made of? I got pure dino to compare and with most I get about 600 miles on a tank. With Woodman's diesel the best I got was 540 miles. That is comparing dino with dino. My point is that since you have B20, you don't know where the 80% came from. In your case, you could have biodiesel mixed with really good diesel vs 100% dino of average stuff.

I used straight diesel and mixed B100 in it to get varying mixes of Biodiesel and I run the tank almost dry. I found that keeping the dino diesel consistant I actually lost a couple of mpg.
Well what I meant is I have not been about to compare with B80, B99 or B100 becasue I have no local sources....

I did notice a drop in milege the last two months I was running pure Dino (price differential was too great) when prices came back to earth at the Navy exchange I went back there again...and my milage per tank has improved again.....but I have heard of others who had decreaces in milage running Biodiesel blends...I have seen increaces...I guess its a case of YMMV
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1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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