I decided to ask shell the simplest question poss regards octane drop off whilst it was sat in there tanks this was there simple reply.

Hello Mr McCord,
Shell Optimax has a guaranteed octane value of 98 RON, the typical value is
98.6 RON, the octane value will not degrade over a few days whilst it is
stored on site.
The majority of sites have two or more deliveries per week, these are in the
region of 8,000 - 15,000 litres per delivery, so the fuel does not stay in
the tanks for very long.
Petrol can be stored for upto six months before any noticable change in the
octane value.
Regards

Matthew Wagster
Customer Service Professional
Shell U.K. Oil Products Limited
Rowlandsway House, Rowlandsway, Manchester M22 5SB, United Kingdom

Tel: +44 (0)800 731 8888 Fax: +44 (0)161 499 8088
Email: matthew.m.wagster@ope.shell.com
Internet: http://www.shell.com/uk

Notice it states guaranteed octane rating, doesnt say at what point it is guaranteed, there tank or ours

 

They do state that it can be stored for upto six months without any noticeable change, surely this now answers the question.

Si.

[Edited by sillysi - 8/8/2002 2:16:38 PM]

 

Note the use of the word 'noticeable', as opposed to 'measurable'.

 

Least they had the courtsey to reply to you

Better than most

J

 

I get the impression that some people will never believe what Shell are saying

Si.

[Edited by sillysi - 8/8/2002 2:21:42 PM]