Not running preimium fuel ?? You running her easy or what.
I don't think you really understand about octane mate
Running a higher octane fuel than is needed to prevent pinking/detonation, is actually gonna give you less power. The octane rating is about how resistant the feul is to knock, & nothing about how much power it produces
The higher the octane the slower the petrol burns, so running super unleaded in the WR is gonna result in less power, coz by the time it has all burnt, the piston is on the way down the bore.
It has nothing to do with 'running her easy'
The WR does not detonate with 95RON unleaded at full throttle and revs so there is no need for the 98RON of super unleaded.