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Originally Posted by Riyad Aliyev
But i think in Geneva, V-power from shell is an 100 octane, and nothing else, because if v-power is equal to 93, (as i understood) then what is "Sans plomb 93" also which is offered in Shell gas stations?
Because if this is something that is even lower... A friend of mine has Mazda rx-8 and he puts Sans plomb 93 into his tank, and i think it wouldn't run on that if it would be something les than 93.
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You need to determine what the 100 V Power, and 93 sans plomb (unleaded) are in terms of RON. RON is the usual measurement in Europe. There is a 6-7 point spread between RON and pump octane, which is (R+M)/2, where R equals RON and M equals motor octane method. Again, it is not a precise conversion because it depends on the specific fuel.
I would guess that the 93 unleaded your friend uses is very close to 87 pump octane in North America. Just as with the BMW engine, a Mazda will run fine on 87 pump octane, it just may not develop all of the power it is capable of.
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