I explained it in simple terms to keep life easy for someone with a simple question. I am well aware that higher octane technically burns at a slower rate. This is to help with premature ignition, giving a larger burn. With consistent regular fuel COULD lead to fuel not being properly burnt, which can cause buildup on valves especially after 8 years 80k miles. Running higher octane, as well as driving harder, will allow for higher air/fuel flows while the engine is in higher RPMs. These higher RPMs, along with a slightly delayed detonation with the higher octane, will allow for a more full detonation and burn. Having a larger detonation within the cylinder will cause the need for higher exhaust vacuum, which is joined by higher temps within the cylinder. Combine all of the above and it will help clear carbon buildup.