Fuel

[j3gq_imp]

Here in Colorado, regular grade E-10 gasoline is 85 octane, not 87. My CB ran great on 85 even at 14.000’+ elevation. Zero pinging, zero noticeable power loss, zero issues, and gas mileage in the mid-60’s.

Knocking depends on how much power you actually pull. Knocking isn't ever an issue if all you pull is 30 HP at 2500 rpms. The Honda guidelines do have to take into account that somebody may run her at high rpms all/many a times.
The impact of elevation (or atmospheric pressure), this is compensated for by the injection system.