Bentley Continental GT Mulliner Ed. 2005 6.0 Petrol Emission

[nickl33333]

Hi,
Looking for some advise on:
-Emission Light.
-Wheel Fitment
for my: Bentley Continental GT Mulliner Ed. 2005 6.0 Petrol Emission

the Orange Light that looks like an Engine block (Engine Warning Light) in Most Car's (but i have checked the Manual and it say's its Emissions and the EPC light is Engine). is now on. what causes this?

i used 95 Fuel instead of 98, as i did not know it was needed, it even says 98/(95) on the inside of the Fuel Cap like its a advisory.

should i be adding an additive to bring the Fuel upto Super Fuel? i know sensors go a lot on this Model, how do you know if its a Faulty Sensor?

-Wheels:
im looking to get the Largest Possible Wheels on this Car,
how would i find out how large i can go before i need to start rolling arches, i don't want to make any adjustments to the arches at all.
i guess he Tyres would also contribute to that?

-Finally the Display say's Tyre Pressure not available,
why could this be?
and if i fit new Wheel's im guessing i won't be able to use that?

-and Finally Finally, there is a Wuring Noise sounds like its coming through the Speaker, like interference,
is this meant to be the Exhaust sound playing through the speakers?



Thanks Guys!!