Nah this was on a Stock ECU when I did it. Never put in 91 when I was tuned for 94 of course! Come on!
Anyways, I’ve been doing some Googling and it does seem like Shell V-power has no complains at all.
I’m sure if it was “94”, everyone would be using it. I guess people just think that higher octane is better in general. But if you aren’t tuned for 94, there’s no point in putting in 94.
Seems like a lot bikers have issues when they use Sunoco 94.
Apparently Shell 91 will give you better mileage too due to it having no ethanol which burns faster.