Interesting graph but wrong application. That graph is for a blower bearing which has very different load compared to a vehicle bearing. The load on a vehicle bearing is much greater and acts 90 degrees to the bearing putting most of the load on just a few rollers.
Good hunting though.
I agree that gains here will be slight but as you pointed out the more overall efficiency you have the greater percentage gain.
Splitting hairs for fun and profit.
Bar graph from timken:
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