Ioniq smallest tire size 195/65R15
Ioniq EV 205/55R16
That could explain little bit and that difference is little between the models. Front tire deflectors looked universal in the EV version so they dont compensate wider tires...
But most of all those are just OEM figures which they say Cd is, for many reasons they almost never are accurate. So I would not look too much on those figures, maybe the gas version gets some benefits on taxing by reaching lower consumption figures on paper and thats why its said to be lower Cd even in reality its not.
But lets try to keep this topic about those simulations, easier for everybody in the long run to find data.
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