thinking of buying altezza soon, choice of AS200 or RS200, i learnt RS200 is much quicker than uk spec Lexus IS200 & different engine as well. & AS200 is similar 2 uk spec IS200.

japanese cars prefer 2 run on higher octane fuel that isnt readily available in uk (100 RON unleaded) only 95, 97 or 98RON unleaded in uk. i heard if some jap cars use fuel lower than 100 RON unleaded, is not too good for engine especially if that engine is design 2 ron on 100 RON unleaded?

doee any 1 kno if this applies 2 Altezza both AS + RS200 ?? i mean i heard of petrol octane booster that can help or sort this out.

There are stacks of second-hand Jap import Altezzas in New Zealand, as well as the Lexus 6cyl IS200's. I've got the 4cyl 6spd RS200 and have never heard that our 96octane is detrimental to them, even with the compression ratio over 10 to 1.

I try to use the only 98octane available (BP, at 'selected' service stations) when I can. The anti-knock sensor should take care of any problems with lower octane fuel. I used to use 10% Toluol as an octane booster in my rally car...

Big debate on the Aussie section of www.skylinesdownunder.com
"what do you use" regarding the octane rating/ suitability in their cars and the general consensus is BP Ultima against Shell Optimax. Ya pays ya money........

I have an RS200. It's been running on premium unleaded 98 fuel with no problems. Have yet try an octane booster (hmmmmm..) Was told by the dealer it needs at least 95 octane. Hope this helps.