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Just put a lower grill block on my BMW 325is this morning, and drove the car about 130 miles, mostly highway cruising at 80 mph, but also in some freeway commuter traffic and some in town.
So, results are highly subjective, at best preliminary, and based on the on-board fuel computer, which has been reliable in the past. That said, at highway cruise speed, the OBC indicated a mile or two better mileage over the same stretch of highway that I've monitored many times before, and the car "seemed" a bit smoother and quieter, presumably due to less turbulence. This is not a proper test, only a preliminary impression, so take it as such.
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