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Petrol and diesel are completely different. As is the way they work within the engine.
Higher octane petrol works and has been proven time and again it does.
Diesel on the other hand has no proven record of improvement and I don't even hear any company making any claims it does.
I'm surprised reading comments about a diesel engine running smoother and getting a couple of extra MPG. On saying that I've always felt that about any of my cars and quite often it's day to day with the same tank of fuel.
Guess a lot has to do with the placebo effect but I'm glad you guys are happy paying more for petrol. Pays my wages!
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