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Old 11-15-2012, 04:00 PM
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greyX1 greyX1 is offline
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Location: California
 
Join Date: Oct 2012
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Mein Auto: 2013 s28i X1
wind resistance (drag) increases with the 2nd power of velocity. at slow speeds (low turbulence) differences in velocity are less significant, but in the 70/75 range, the difference in drag, and therefor MPG, can be large. i wouldn't totally discount the speedo "error" as a marketing device for owners to achieve seemingly better MPG, and even faster apparent acceleration times!

curious though - don't Germans pride themselves on always being on time? or is that just the Swiss-Germans? they still drive BMWs too though....
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