i totally agree with every thing you said and just done 700 miles on a full tank of diesel (esso garage)whilst on holiday 360 motorway miles and the rest on a & b roads, i have not noticed any power loss and i only noticed the problem when pulling out onto a fast single carrigeway a road and happened to look in the mirror to see if any one was fast approching me behind. Now i know of the problem i find myself just checking to see if its fixed itself.