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Appreciate you taking the time to look at my videos and coming up with the numbers. To be clear, I never thought that the fuel consumption would be cut in half, what I said was: "A 50% reduction in rpm manifests less than 5% better MPG in your mind?" What I was trying to convey with that...

Back to this point for a moment. Your own data on the 3116 shows a 50% increase in Fuel consumption between 1200RPM and 2600RPM at full load (dyno test). Now you also say at some lower load, that consumption delta drops all the way down to 5%. That didn't make any sense to me but I figured that...

That is an interesting study, they were able to gain 22% efficiency out of the FMTVs by testing other transmission and gear ratio combinations. I my opinion, the most relevant part from their conclusions to this discussion: "The key enabler to the 22% improvement is the final drive ratio."

The whole discussion really centers around this particular bit of data. Would a legitimate test be to datalog the fuel consumption rate at a set speed before and after the hub change, with all other factors being equal ?

With stock gearing, it essentially required 2800 RPM to hit 62mph. Deleting the reduction hubs basically halves that to do the same work. A 50% reduction in rpm manifests less than 5% better MPG in your mind? Any sceptic can test this immediately by simply driving their daily driver around in...