Doubleclutch my local LE rep called a few weeks ago and mentioned to me that they have developed a new fuel additive. The 2400 that i use apparently does not contain a cetane booster or some specific algae preventative. I asked if i had the new stuff, and read him the bottle and he said no i did not. This new stuff is supposed to be a one time good deal for it all, the lubcricty, cetane, antigel... . the whole works.
So i can't specifically answer whether or not we use the same product, but the next time i order i will definitly ask about the "new" stuff my rep told me about. I order it by the case directly from LE. I have not been able to find a dealer in my area or on the net. It's kind of spendy at about 135 bucks shipped, but i've had my case for a year now and still have plenty left.
A bottle does 125 gallons, at 24 bottle a case, well you can see it'll last for some miles.
And about the LSD, bill is right, if lubricity was absent, there would be tons of trucks broken down and the problem would be addressed very fast. I've been reading up on ULSD for some time and the lubricity issue is a major one the companies have been looking at from day one. They wouldn't be tarnishing they're name for being blamed for taking down entire fleets of diesel pickup's, it's not good business. But if you need a reason to buy an additive then go ahead and believe that oil companies are out to get us all and make bad fuel so we all buy new injection pumps every month.
Attention: TDR Forum Junkies 
Where abouts is your buddie's shop? One of the last things Kevin Dinwidde from LE mentioned at May Madness was the need to use a lubricity enhancer in the fuel suppliment you use. Guess you're friend confirmed Kevin's advice. 
