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Many sources say that car's cd should be 0.34-0.36, I got measured 0.36, but when I tested rolling resistance at lower speed I got more accurate CRR and cd was 0.429.
I think that I just drop 0.429 out and do estimates from 0.36, with kamm several test's average shows cd under 0.3 so that would be around 18% improvement I guess.
To get under 0.28 I don't need much, reduction of 0.02 would be enough. Because there is now no airdam underside makes more effect when implemented, rear wheel well covers, air guides to front of front tires and some mini boat tails behind the wheels and I think it should be relatively low.
However current cd being under 0.3 now is still subject to error, but it is average of many runs so it should not be hugely off, also I did use GPS to log speeds at every second so it should be really accurate, especially as it is average of several runs, but still, it is so small error that makes so large effect that there is not knowing how accurate that result really is.
It might be autumn until I can test more though as car would need inspection at tuesday and I can't afford it now, so I take it off the road for now. It is few months of cycling for me, oh and also patching the roof of garage and such sort of extra costs that popped up.
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