Why 97 RON fuel?

[The Wookie]

Mattt said:

Mikeyboy said:

Mattt said:

You can get 102RON in some stations in the UK

I'd love to see if I could notice the difference with this stuff.

You wouldn't really.

If you mapped for it, then you probably would

I'd say on most cars, any performance improvement is more likely to be caused by the decrease in the weight of the driver's wallet

[Anh]

97-99 RON petrol will make very little difference at WOT and high revs ...

It is the MON rating that matters, but this is hardly ever published, and you will find that V-power and Ultimate have the same MON rating as each other.

[Mattt]

Anh said:

97-99 RON petrol will make very little difference at WOT and high revs ...

It is the MON rating that matters, but this is hardly ever published, and you will find that V-power and Ultimate have the same MON rating as each other.

Why does MON matter?

I thought they were just 2 methods to compare the fuel to an iso-octane/n-heptane mixture?

[Anh]

Mattt said:

Anh said:

97-99 RON petrol will make very little difference at WOT and high revs ...

It is the MON rating that matters, but this is hardly ever published, and you will find that V-power and Ultimate have the same MON rating as each other.

Why does MON matter?

I thought they were just 2 methods to compare the fuel to an iso-octane/n-heptane mixture?

To obtain a MON rating for a fuel, it is tested at higher RPMs at full engine load. Where as RON is mid RPMs part load.

I tried Ultimate 102 RON, which had a MON rating of 90 and that was fantastic for my GTR. Of top of my head, BP Ultimate and V-power has a MON rating of 86

[markCSC]

I read somewhere that there are only 3 types of Super Unleaded

Tesco 99 Ron
Shell V Power (99 RON)
Normal 97 Ron (BP, Esso, Total etc are all the same )

Anybody care to comment?

PS this excludes the semi-race 102 RON fuels

[SmoothRB]

Towards the end of WW2 the Allies were chucking 150 RON into their Spitfires.

[markCSC]

SmoothRB said:

Towards the end of WW2 the Allies were chucking 150 RON into their Spitfires.

From British Oil wells
http://www.dukeswoodoilmuseum.co.uk/War%20Years.ht...

[tkdsteve08]

Petrol is soooo expensive now i dont even wan't to pay for the 95 crap