I've had my GTD just over 3 weeks and made a decision to run it on Shell V Power Nitro+ Diesel, I was pretty sceptical about the benefits but thought it's only another few quid per tankful so why not. Anyway I hadn't thought much about MPG figures, Tank Range or anything else until yesterday, I'd left London with just under a quarter of a tank and had a 60 mile journey home to deal with, getting diesel before I left was a bit of a pain as the Shell garage was a bit out of the way so I thought I'd chance my arm and get it near where I live, after a bit of traffic I made it to my Local shell garage with a range of 10 miles left, but typical they never had no V Power diesel so I just chucked £20 of standard diesel in it, when I started it up it gave me a range of 205 miles but that quickly dropped and by the time I got home after about a 10 minute drive and about 3 miles it had dropped to 170 miles range. I never noticed any difference in how the engine was running but I was surprised at how quickly the range dropped, using V Power it had never done that before, so I guess there are benefits to using VPower over standard diesel, I'll always use it where available, just annoyed I put £20 of standard diesel in it now