Let us know how your MPG improves, if any. I've heard that the more octane, the faster the fuel burns, thus, less MPG. BTW, don't all grades of gas have these cleaner additives? I'm not trying to " harsh your mellow" but gas is gas IMHP.
You've got it reversed. Higher octane = more resistant to combustion, which is why high-compression engines use high-octane fuels - because it reduces or eliminates preignition due to compression.
Compression heats up air - that's how Diesels work. That's why Diesels don't run well on gasoline - it burns too quickly (even AvGas or racing fuel, with an "octane" number in excess of 100, or equivalent to 100% pure octane.) Diesel fuel is closer to kerosene than gasoline (jet fuel is also close to kerosene - in fact, I recall it being closer to kero in properties than Diesel.)
Gas isn't quite gas - it's a complex blend of hydrocarbons, with proportions varying according to the final AKI (Anti-Knock Index) number.
As far as cleaning? Acetone is already added as a cleaning agent to fuel, so I just dump in two ounce of acetone per ten gallons of fuel (about a four-ounce bottle to the tankful) every two months or so to break anything up that's accumulated. It's certainly cheaper than running higher octane than needed.
Oh - if you track it carefully, expect you fuel economy to go
down slightly - you tend to require higher compression to take advantage of higher-octane fuel.
I find it easier - and cheaper! - to just add acetone at intervals. I won't buy a vehicle that "requires" high-octane fuel, either. If I want one, I'll build it...