Motorists insist Tesco to blame for fuel breakdowns in Faversham:
http://www.kentonline.co.uk/faversham/news/motorists-insist-tesco-to-blame-48151/
This rumour has been running for a few years now, and the latest story just confuses the issue, with Tesco saying it was water contamination that affected "a handful of customers". I've personally avoided cheaper fuel for a long time because a replacement engine is more costly than the difference in fuel price.