BP Ultimate?

When I owned a RR-4 I phoned Honda who confirmed that super unleaded would make no difference. I don't know about the newer RR's though.
I don't bother with it with my SV, but I wouldn't fill up with supermarket fuel either (due to lack of detergents).

Originally Posted by Blue_SV650S

Is there a single bike on the market with a 'knock sensor'?!?!?

Only the big BMW k12 has a knock sensor to my knowledge.

Plus I did alot of testing on this a few years ago that I wrote about on my blog, as the 'fuel companies' try to push this stuff to you in there advertising. In the end I came to the conclusion you get a minor increase in mpg that is cancelled by the cost. Does seem to help the engine a touch and ease carb icing in the curvys, though with the price difference you see now it might not be worth it.

really should make a minimal difference to power and economy. Not really enough to say you can really feel it.

As Yorkie says its only in a forced induction system where the higher octane fuels more predictable combistion really gives you noticable improvements.

Some engines are optomised to run on super though (like the M3) and wont run smoothly on standard pump fuel as the ignition as all set up wrong for it.

I doubt that any bikes on the market will be able to change settings sufficiently to make the most of the higgher octane fuel

[Steve_God]

Cleaner engine = smoother engine = better 'feeling' of performance.

only ever put posh fuel in my curvy, after reading about carb icing etc on here. but i've found quite a good gain in an old car, you can advance the ignition a good bit further without risking pinking. power! (a little anyway)

[yorkie_chris]

You're wasting money there fella.

Kev hasn't said but he's found out on the CBR forums that the 07/08 RR has knock sensors ...

[Biker Biggles]

I use ultimate in cold damp weather on the curvy to prevent carb icing.I found it helps on that front but never noticed any power increase,probably because there isnt one.

[Bibio]

all i ever use in my k8 is optimax. filled up with regular unleaded once by mistake and i could defiantly feel the difference it was like i was running with my db killer in. to add to this my brother has a duke 750ss and it runs pretty crap on regular, doesn't start as well and tick over is a lot rougher.

but make your own mind up ..

[yorkie_chris]

Oh yeah, you do get to a point of ignition advance where there is no more power to be gained from it, even if you raise the knock limit.

It's very dependant on the engine in question.

Premium/regular isn't just octane, it's density and a load of other factors too.