buddy even i thought its 87 RON n HOBC as 90 RON but those r past now....i ve researched and asked refinery company here our HOBC is confirmed 93-95RON as u see many of our car cant run below 91 RON...such as markx, rx8, and many cars which got high compression engine such as more than 10.5:1 -12:0....it will never run below 91 RON....as for super some pump give better quality than other most of them r mixing n some r giving 100% super which is definately above 87 RON
even i ve tested my markx n my grandfather E250cgi on HOBC n few time mix 50/50...it run fine no knocking only on Super it run sluggish with bad mileage...civic reborn sometime i add 10% HOBC otherwise run 100% Super, as for civic reborn n new civic it need 91 RON...u can check on the owners manual for honda R18 engine