how good was the data collection? to be accurate both the chain and the gear drives would have to be measured under the same conditions
which means , the same tyre the same track exactly the same atmospheric conditions etc etc . when measured in a lab under identical conditions the chain is more efficient.
the differences are very small though .
Not saying you're wrong, but it's hard for me to get my head around the HyVo chain being more efficient. The difference between the chain engagement friction alone, half way around 2) 28 tooth gears, versus partial gear teeth engagement of 6 teeth (counting all 3 gears)? Not to mention the additional mass of chain versus gear the engine has to spin up.
When you look at the wear marks on the HyVo gears, crank and primary, it's usually pretty significant. Look at some DOHC crank gear pictures on eBay. There's been some serious rubbing going on, engagement/disengagement! Pretty sure the HyVo efficiency goes down with increased RPM's.
Morse efficiency chart - but they're selling the stuff of course and don't chart above 4500 RPM: