I would personally like to see the overall quality of diesel fuel improved in the North American market. Give us better lubricity, higher cetane and lower aromatics.
They don't mention what precisely is improved with the nitrogen enrichment other than to say it may provide a fuel economy increase. Often it is noted that fuel economy increases on ultra-high burn commercial vehicles (6 MPG tractor-trailers) are rarely, if ever noticed with high efficiency automobiles such as VW TDI's which already deliver in excess of 45 MPG.
Yes, I think our fuel quality could be greatly improved upon regarding lubricity and cetane. The question remains at what price.