I wouldn't take it personally, that's Slow's way of conveying what he's learned. He's critical of my posts too, but often has very good points.
A 7% gain in fuel efficiency simply cannot be accounted for by a lower weight driveshaft alone. There are unaccounted variables at play.
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The datapoint is fine and appreciated, but clearly not sufficient.
I too wouldn't want to change out parts a bunch to do more thorough testing. Just enjoy the mod.
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