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Yeah, Edgar has said that when he tests modifications or devices to improve aerodynamics on a car, he's looking for at least more than a 1% drag reduction, and preferably at least 2% or more before he considers it worthwhile for implementation and further testing. At such small levels of improvement, it's darn hard to separate the noise from the signal due to all the potential misleading influencers like wind, grade, inadequate testing instrument sensitivities, etc and etc.
But the fact is, we're often faced with eking out small gains if we're going to make improvements in fuel economy from some starting base, but even a few ones and twos can add up to fives and tens and more, eventually.
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