I'm sure I read somewhere that empty bars create more drag than bars plus a roof box.
Probably depends on the bars (and a whole load of other variables!) I've not noticed much drop in range with my aero bars fitted on the Niro (although I do tend to take them off ASAP when not in use, so not a lot of data to make the comparison), but with the roof box on it loses ~20-25% at motorway speeds (although some of that is probably attributable to the increased weight since we only use it when the car is fully loaded anyway).
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