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I was making no statement of effect, nor implying anything other than statistically there will be an economy change.
Are you sure? Because you also said
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Here's the results of standardised testing in a lab. Will have to do the comparative review, as it's all against a standard reference oil.
It is the comparative review comment that raised my interest.
Are you saying that you would compare the 5w30 listed versus the test standard (15w40) and then also compare a 5w20 versus the test standard (15w40, obviously getting that data from a different source or reference because it's not shown here), and then draw a conclusion about 5w30 vs 5w20?
Can you please clarify if this is the case?
If you were to do so, you may be correct, but you may also not be accounting for a non-transitive probabilistic comparison effect and therefore drawing an incorrect conclusion.
With respect to your statement that real world results couldn't be measured on the road due to overwhelming noise due to uncontrolled variable factors, we are in complete agreement.
Looking forward to your response.