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I don't really like declaring the un/success of a mod based only on the butt-o-meter readings, but I did a 100 km highway trip with the partially finished Kammback on the car today and definitely have the impression that the car is getting better MPG at certain speeds than it used to.
It was a 100 km highway trip with city traffic at both ends, and I didn't P&G at all on the highway (just DWL). Managed 71 mpg (US) overall, with a "target" speed of *around* 75 km/h (47 mph) on the highway when there was nobody behind me (limit for most of the trip was 80 km/h) and a downpour/wet roads for the last 10 km.
At a couple of familiar stops/intersections, I definitely coasted in hot and had to jump on the brakes.
Subjective, subjective. Proves nothing! But the difference feels bigger than the 2.5% I saw when I tested the sharp-shouldered prototype.
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