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Old 11-01-2005, 05:38 PM
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Rocket Fuel Diesel Experience

I just finished a load of straight dino diesel that gave me about 26-27 mpg and that was with my little pig-cart trailer behind the car for about 50% of the tank. I generally get about 23-24 mpg and, depending on the load on the trailer, may dip down to 21.

The engine seemed to idle about 100-150 rpms faster and, there was a decidedly distinct klatta-klatta that hasn't been present with prior tanks or, the load of fuel I'm presently carrying. However, I couldn't detect any difference in acceleration or how much throttle it took to maintain a specific speed.

Anyone else here ever encounter this phenomon?

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Old 11-01-2005, 06:20 PM
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Yes, I have gotten a load of fuel before that made the car run "smoother" it seemed, it had a little more "hill climbing power" and got a couple better mpg's as well. 99% of the time I get excellent fuel anyways, but this stuff was better....I could just tell/feel it.
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Old 11-01-2005, 06:31 PM
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Location: North Dakota
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I noticed it last summer when I sneaked a tank of farm fuel in my 83 and used Howe's fuel additive. When I went back to low sulphur my mileage went back down to what it was as did the power and engine noise. I also noticed a difference in my farm tractors when I took the same farm fuel and added used filtered crankcase oil to the fuel. The tractors had more smoke but they also had more power and gallons used per acre went down. Personally I think we are getting rotten fuel. Anything from low cetane to fungus. You may have accidenaly got some primo-dino.
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Old 11-01-2005, 07:17 PM
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I understand the low cetane content in some fuel. Is the normal dieseling noise that appears when we don't use an additive damaging to our motors in any way? Is the noise purely an esthetic concern or a lack of power, mileage, smoke concern. At work there are a couple of new v8 turbo diesels that clatter like a you know what, no additives. I stopped using additives awhile back only because I ran out and haven't replenished(though of course I will use again when the temps drop) and now my little 240d sounds like the big v8 clatterers. Is this a bad thing?
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Old 11-01-2005, 09:30 PM
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FWIW, I have noticed that my 300D which got 23 MPG for years has been getting 27 MPG since about last spring. I can't explain it, but, knock on wood. Haven't really checked the other 2 diesels that closely. Maybe I should do that.

Randy, maybe you got some of that red dyed off road superfuel.

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Old 11-01-2005, 10:11 PM
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Most of the diesel sold at the pumps is 40-42 cetane cat pee. Every once in a while you will find 46-50 cetane and yes it makes a palpable difference. The fuel we are forced to purchase at the pumps is truely crap. I can back up a 1/2 to 1 mpg difference when using Stanadyne Performance Formula in the work truck. Gotta be the cetane increase. RT

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