Many moons ago I operated 206L on low skids with skid fairings, which got along fairly well at about 108kias. A complete professional polish with an approved Teflon polish put the cruise up to ~115kias, and later a further polish of the blades (after much checking with Bell for approval) nudged the cruise up to 117kias, all with the same power and OAT, etc.
So, the initial fuselage polish was predominantly responsible for the improved performance, all from an asthmatic C20!
