Has anyone ever noticed much of a difference in economy or performance when using premium diesel over normal diesel.

Iv run 2 tanks so far if premium diesel. Never used premium diesel before so not sure what to expect from using apart from what iv read.

So far not been impressed with the economy compared to what iv spent. I.e £40 have managed about 250-280miles town driving. Is that what to expect or should i be getting more miles out of it?

I certainly know that using normal will obv give me more miles per pounds therefore am considering switching to normal diesel so i can get more miles out of it.