I have had my car nearly 5 years now, and i can count on 2 fingers how many times i have used 95 petrol. Both times were about a tenner, and if i am honest it was only because a) i was running out of fuel and they had no super, or b) i was feeling very skint.
However using Optimax, then Vpower always, i thought i would try Tesco 99- and true to form, you cannot tell the difference. At the time, Tesco was cheaper than Vpower but now its the other way around. One thing i have learned from this thread (excuse how stupid and borderline naive i am) i should apply for a clubcard. I did have the V power card, but most times (well always really) i would pay, then think 'oh bugger forgot to use the card again lol)!!!
I do agree about the weight thing though, my LCR feels like a slow pig with a full tank, unless of course its on the motorway (will not go into the scientific information..leave this for other peeps haha). But as most LCR owners will agree it goes from half to empty in no time at all.