I have a 2018 Honda Odyssey and I started to get concerned about long term DI carbon build up. I know fuel doesn't reach the valves but I also know of some new Honda DI motors clogging up injectors under 30,000 miles. My thoughts are wouldn't the 10x more cleaning power / additives of premium top tier fuels like Shell or Mobil help somewhat? I have a local Shell station that moves allot of gas. They have one tank for regular and one for the V Power premium stuff. When you purchase mid grade they just pull from both tanks something like 38% premium and the rest regular. That would keep me at 89 octane but get a dose of that premium cleaning additive on every fill up. Anyone think there could be some DI engine value by doing that? Again I get that there won't be any valve cleaning but injectors are still an issue with DI from what I gather.