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To my layman's eyes, it looks like there is more bending of the stream in the image with the device, bending means acceleration which in turn means a pressure difference. And that, to me, means that the pressure behind the truck is actually lower with the device than without.
Thoughts from the experts?
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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