On Fri, 21 Aug 2015 09:44:51 +0100, Brian-Gaff wrote:

Storage of fuel surely has to be nailed by now.

Quite the opposite. Modern fuel is more volatile than it used to be, and
"goes off" more quickly.

Supermarket fuel comes from the same small handful of regional
distribution depots as any other fuel. Their tanks are fed from the same
pipelines from the same tiny handful of national refineries as any other
fuel.

The ONLY difference is the almost homeopathic buckets of additive poured
into the tanker at the time of filling.

Remember - the basic diesel and 95RON Premium Unleaded petrol are
governed by international standards. If it doesn't meet that, it can't be
sold. Cars are developed to run perfectly happily on that basic standard
of fuel.