i have only had jdm, and as far as i know they need super unleaded as a min - but i have not had a mappable ecu only a replacement chip - someone who has had this done might be able to tell you otherwise but i doubt anyone will have asked for less octane tuned vehicle due to not getting the power from it.
im guessing uk scoobs will run unleaded or super unleaded though as they were designed for uk fuel
im sure someone will be along with a deffo answer for you though - oh & welcome along
