I can only speak of my experience here in Australia. I always tell folk to run 98 in there R3. Premium. Search this topic and you will see why again and again. I occasionally put 100 in my car and it runs clean , just like it does on 98. I can only give the facts I have found through my research and testing. Here our std fuel is very dirty and poor, we call it cats pi$$. It is ok for washing parts. Is the 100 you are going to try ethanol mixed? We have United 100 here which is 10% ethanol and R3's run fine on it.