<DIV>i know their must be a few here that know the exact difference of the two and how much performance (heating units)is lost with the winter fuel, and what the changes arehttp://www.dieselplace.com/forum/smileys/smiley17.gif</DIV>
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<DIV>i called both of my bulk dealers(esso and coop) and neither could give a answer, one said he had heard a 10 percent decline in mileage by truckers, with the winter fuel, did a search but found nothing, thanks for the replyhttp://www.dieselplace.com/forum/smileys/smiley32.gif</DIV>

The BTU content of No. 2-D diesel fuel is generally higher than that of No.1-D diesel fuel. The BTU content of No. 2-D diesel fuel is typically about 130,000 BTU/Gal. 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. Typical No. 1 BTU yield is about 120,000 BTU/Gal. Diesel Fuel No. 1 is also lower in viscosity and provides less lubrication for the fuel pump. Average Cetane for No. 2 diesel is about 40, No. 1 diesel will be higher than 40.

<DIV>thanks bmdmax, exactly what i was looking for,http://www.dieselplace.com/forum/smileys/smiley32.gif the esso dealer did tell me the mix of winter fuel gets stronger as the winter goes on then the opposite happens as the spring comes, the other dealer said that as of oct 15 they switch right to winter, and as april 1st back to #2, thanks again</DIV>
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The BTU content of No. 2-D diesel fuel is generally higher than that of No.1-D diesel fuel. The BTU content of No. 2-D diesel fuel is typically about 130,000 BTU/Gal. 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. Typical No. 1 BTU yield is about 120,000 BTU/Gal. Diesel Fuel No. 1 is also lower in viscosity and provides less lubrication for the fuel pump. Average Cetane for No. 2 diesel is about 40, No. 1 diesel will be higher than 40.

I buy #2 all winter and add my own additive package. At least I know what I'm running.