Before the euro i owned a hyundai excel - and i could feel the difference in that when i cheap fuel was used as opposed to shell / BP...

As for the euro i got slightly better ecconmy with BP 98 than BP 95 - i only get 98 due to its clensing properties....

I still dont quite understand your argument Mr Will - We are talking about little minor adjustments to timing which in the grand scheme of things really means stuff all on a stock motor car - i doubt many people would acually feel the difference between 140kW and 150kW let alone 140kW Vs 139.5kW if infact your argument is valid (which i can see no reason for there not to be)... Say i do loose power - i'll spend 30 mins indexing my plugs and i will have it back again - more than one way to skin a cat