But my PI only gets Optimax unless I am desperate and can't find a Shell
station. It runs noticeably worse on anything else.

Jim - I support this view 100% based on recent drives in my PI. I've dialled
in a wee bit more advance to make use of the Optimax claimed higher than
98.5 ron - sure sounds sweet, big improvement. I used a tank load to travel
to Scotland recently, had a great drive. Then had to fill up using BP
superunleaded - noticeable difference, didn't pull nearly as well.

I've even started using it in my 92 VW Scirocco (which claims to need 98 ron
anyhow) - same story. Tweaked the advance again, crisper response - cleaner
idling note too.

Chuffed, well worth the extra few pence per litre.
--
Ken Davidson


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.532 / Virus Database: 326 - Release Date: 27/10/03