Car manufacturers almost always release drag coefficient data rounded to two decimal places, so the 0.31 is actually 0.31 +/- 0.005.
Maximum possible value:
0.315x0.937=0.295155
Minimum possible value:
0.305x0.937=0.285785
The error in the measurements even after the 6.3% drag decrease is thus 0.01, there is no way that 6 decimal places is in any way scientifically appropriate.
It is completely irrelevant whether it is 6%, 6.3% or 6.3000%, the margin of error from the original Cd is way too large to get anything remotely accurate.
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derived from this literature might offend only those who've never attempted the voyage.
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I think the people it may offend are scientist and engineers who know the limitations of margin of error.