Ordered H&R 40/30mm lowering springs estimation is that the drag coefficient will drop 0,01 to 0,014. That would mean car is already at 0,23 to 0,226 range. If Cd drops 0,014 units it would mean 3,2% better energy consumption. Total improvements would be close to 10% compared to stock car. In range that means you will get 42km more range in this version. I think 15% better consumption is possibly even without kammback extension.
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