Intresting because my brand new corolla gli does knock on regular and manual says to use regular fuel i havent noted the ignition timing advance though would do so next time but its all to common for new corollas and cvic to knock even though supposdely they only require regular fuel
So either the regular fuel we are getting is below 87 at most pumps or just like there is no truth in that the more the octane the better it is also NOT a universal truth that if car is required to be used on 87 it wont benefit from hi octane or that its simply burning money
There are too many variables involved
And one cant say that brand new cars have some faults and its pinging because of that
Thats one variable you can exclude.
btw its not just shell but i can point to many links where companies promise that there hi octane fuel has more cleaning additives and detergents than their regular fuel, Esso in uk for example, and as a law student i can point to many lawsuits filed against esso on other matters but this claim of theirs is not just marketing bloatware. similar for other companies, in meeting Pakistan fuel companies don't make available actual spec sheets but it cannot be said that hi octane in all situations from all companies will never have more cleaning addictive it will.