I looked thru 9 pages of threads but without the search I can't seem to find the info. And I know you guys will have the answer. 
Here's the deal. I'm in an argument with a few buddies about the use of the red fuel. I say it for big rigs and farm equipment. They are buying it and running it in their trucks. (mostly Fords LOL) but anyway below is the only info I could find that was useful when I did a yahoo search. They are saying everything from they are the same except for the red dye and one guy even says that the red dye will dye the engine parts red so the cops can tell you have been running it!!
I just want to give them the real info from people who know what they are talking about. Thanks in advance!
Info I found:
Exxon Low Sulfur Diesel Fuel No. 1 meets the Grade No. 1-D requirements of ASTM D975, Standard Specification for Diesel Fuel Oils. It is intended for use in areas with abnormally low temperature conditions and as a blending component to winterize the No. 2-D grade. Compared to the No. 2-D grade, Exxon Low Sulfur Diesel No. 1 has a lower viscosity and generally provides higher cetane number and better low temperature operability.
Exxon Low Sulfur Diesel Fuel No. 2 meets the Grade No. 2-D requirements of ASTM D975, Standard Specification for Diesel Fuel Oils. It is intended for use in all diesel fueled vehicles traveling on our nation's highway system. Compared to the No. 1-D grade, Exxon Low Sulfur Diesel No. 2 provides higher fuel economy, power, flash point, viscosity and lubricity.
Power/Fuel Economy
Engine design is the most important factor leading to power and fuel economy. However, fuels with a higher density like Exxon Low Sulfur Diesel No. 2 will provide improved power and fuel economy compared to fuels with Diesel Fuel No. 1 blended into them.
Why don'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 No. 1 Diesel Fuel 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.

Here's the deal. I'm in an argument with a few buddies about the use of the red fuel. I say it for big rigs and farm equipment. They are buying it and running it in their trucks. (mostly Fords LOL) but anyway below is the only info I could find that was useful when I did a yahoo search. They are saying everything from they are the same except for the red dye and one guy even says that the red dye will dye the engine parts red so the cops can tell you have been running it!!
I just want to give them the real info from people who know what they are talking about. Thanks in advance!
Info I found:
Exxon Low Sulfur Diesel Fuel No. 1 meets the Grade No. 1-D requirements of ASTM D975, Standard Specification for Diesel Fuel Oils. It is intended for use in areas with abnormally low temperature conditions and as a blending component to winterize the No. 2-D grade. Compared to the No. 2-D grade, Exxon Low Sulfur Diesel No. 1 has a lower viscosity and generally provides higher cetane number and better low temperature operability.
Exxon Low Sulfur Diesel Fuel No. 2 meets the Grade No. 2-D requirements of ASTM D975, Standard Specification for Diesel Fuel Oils. It is intended for use in all diesel fueled vehicles traveling on our nation's highway system. Compared to the No. 1-D grade, Exxon Low Sulfur Diesel No. 2 provides higher fuel economy, power, flash point, viscosity and lubricity.
Power/Fuel Economy
Engine design is the most important factor leading to power and fuel economy. However, fuels with a higher density like Exxon Low Sulfur Diesel No. 2 will provide improved power and fuel economy compared to fuels with Diesel Fuel No. 1 blended into them.
Why don'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 No. 1 Diesel Fuel 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.