It might help to add to add the relevant fuel compositions (E10, E50, E85 etc) to that analysis. * Gates in the USA only make and sell fuel pipe of grade 30R9 or better (they even have brand-new super-grades). Gates in the UK distribute unmarked hose to motor factors that, if you are lucky, is only 30R6. Why don't we get the same? Are they dumping their surplus stock on the UK? I don't think that there's any reason to suspect malevolence or malpractice. And the lead times for introduction of new fuel compositions have been very long. ... But the main points are that problems are very rare with commercially available fuels except with old hoses and non-mainstream products. And that fuel hoses, seals etc should be treated as consumables for vehicles that survive as long as many 7s. Jonathan