hi i recently just moved from usa to england. i am ship my vehichle over. Since gas prices are overpriced in the uk, the gas station i will be going to would be a military one which only offers 95 ron . should my s2k be safe. what is the converstion from ron to to usa octane levels. my car manual says it takes 91 octane.

 

95 Ron is the same as 91 octane in the US.

RON: Reaserch Octane Number. (Used in Europe and elswhere in gas stations)
MON: Motor Octane Number.
AKI Anti-Knock Index. This is the number that is posted on the gas station in the USA/Canada as "Octane". It is derived as (RON + MON)/2

RON 95 is the minimum what an S can take. In the European owners manual it says Ron 98 or better is recommended. You can feel a difference between 95 and 98. The car drives better with 98 premium, the power the engine gives is much better and you have better gas mileage imo

 

Hi, I've tuned a few US cars so I know this. Ha unlucky about moving to the UK, want to swap? Ha.
You'll feel reduced power and Mpg on 95.

91 is equivalent to 95 UK - any
93 is equivalent to 97 UK - BP ultimate/esso supreme etc but available in most petrol stations.
95 is equivalent to 99 UK - shell vpower/tesco momentum only.

Thanks

 

I've owned my 2000 for nearly four years now and fed it everything at the pump (diesel aside) 95 all the way to 99 and not once have I ever noticed any difference whatsoever.......if anything it 'felt' more rapid on cold winter days, though its been known that colder air being denser will always work better for any engine.

 

Well 5th Gear tested several types of fuel on several cars and published the results online. Well it really made a big difference on performance engines. Performance engines gained allot of extra power with premium fuel. You can see their test results here:

 

 

Using Super in an S gives you more MPG, if it's still enough to cover the cost I don't know. But it's more fun.

 

Did you bring your LHD S2k here? I´ll swap my RHD for yours if you want! :-)

 

The guy in the video seems a nice guy but has he proof for his claim? I understand very well what he talked about, and I'm always sceptical about claims. But if someone can proof that the claim is legit with a test, that's a different story.


I always thought premium fuel has a 'placebo' effect on people thinking they get better power and MPG. But I saw some hard proof tests that proof premium fuel does give a difference on performance engines. No, premium fuel doesn't matter on 'normal' cars. But performance cars are a different story. The normal fuel can cause 'knock' which results -> ECU is trying to safe the engine by changing the ignition timing thus losing power, I literally felt that once. This is the simple explanation. You have various tests that can prove that. I see the F20c2 as an performance engine because a 9K redline is not common in normal cars.

 

I've never noticed a difference on an NA S but i think you'd need a reasonable amount of bhp to notice?

Anyway, lets not clog this chaps' thread - he got his answer hopefully?