nickleinonen said:i am pretty sure it is more #1 fuel mixed into the standard #2 fuel... ends up with a higher cetane rating, a little better performance, but lower fuel economy...
No, premium diesel is NOT blended #1 and 2, not even close. 'Premium diesel' is a variety of things. True premium diesel starts with better basestocks, is more refined than #2, and offers better performance, economy, and cleanliness across the board. However, this type of true premium is only available in very limited areas. More commonly found is 'premium diesel' which is only required to meet 2 of 5 criteria which define premium diesel fuels. In short - most premium diesel is #2 with additives put in for detergency, thermal stability, anti-corrosion, cetane improvement, or lubricity enhancement. Add 2 of the 5 characteristics and you can slap a premium sign on the fuel. Sorry this was off topic.