it's basically just marketing, but the mix is slightly different. not entirely different than a big company owning 10 products on the shelf with different brand names, they just end up with more market share.Interesting how your petrol standards differ from Finland. I use only 98 E5, 95 "e10" is the other option but meant for economy cars. contains some more ethanol, max 10%. But there's literally only two options available anywhere. E85 flexfuel is stupidly rare over here so I haven't even bothered (would have to travel 30 miles to fill 'er up) and I highly doubt doing a bit of this a bit of that is a good idea in the long run. Choose one and stick to it and see where it gets ya.
tl;dr We have a ton of jabbering about about massive fuel prices over here, yet I've never seen anything like those octane numbers, different octane measuring standard? Could e95 with 10% octane actually be decent fuel for a v8 flexfuel engine and fuel linings? They market the 98 as "V8" fuel after all.
normally the price gap on gasoline grades is not a lot so one person might go with the lower grade and still spend 90.00 versus 100.00
lots of competition between "brand" names which often all source the fuel from the same source. with a few exceptions
here locally the fuel is pumped into the local port and sent to a variety of stations with different names, but a big brand like Chevron may come from there refinery 80 miles away.