"...And, is the methodology for this test questionable?..."
yes.
In politics there is a paradox, called "voting paradox". It means minority can win election providing they (minority) chose the voting rules.
By analogy, "testing paradox" - whoever pays for test will get favorable results.
My bet that, if Nacco/Nissan/ and Co repeat the same test, they will get absolutely different results.
About honesty...? Ask other manufacturers... they will tell you.
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