Just use a full tank of name brand fuel which has enhanced additives package already at least 1/2 the time and I think you'll be fine (base fuel stock is literally the same for all brands, comes from the same terminals regionally)
Seems like most problems are when people don't do oil changes regularly, don't change spark plugs, timing chain is work and piston rings get worn. Those cars start to have injector and plug fouling. Otherwise, in my rural town, there's tons of old under maintained cars still kicking. Makes me think it's not all that important.
Remember that cars burn cleaner, run much hotter and higher compression that cars years ago. All of these have a cleaning effect in burning up most contaminants. Further, I suspect Honda intentionally injects a little extra fuel on shutdown to prevent carbon buildup and prevent knocking at low RPM's when cold, but it seems to be possibly causing some oil dilution as well. But the side effect is injectors probably get cleaned from that as well.
