I've been under the impression that higher cetane means better fuel. I 've heard that the 350SDL required 60 cetane fuel, so I assumed that higher cetane is better.

Strange thing is, in our area we have a Gulf station selling Gulf Dieselect Premium Diesel (no posted cetane number) for $1.729 when the other local stations are selling 40 cetane diesel for $1.799 to $1.999, thankfully down a bit from $2.299. They have the cheapest diesel in the area.