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Surprising that the slippery Ioniq 6 did relatively poorly compared to the Model 3 in the efficiency comparison. The EPA numbers for the Ioniq 6 are better than those for the Model 3: Compare Side-by-Side .
It is likely that some trims of the Ioniq 6 would do significantly worse in the winter, due to having resistance heating (some other trims have heat pumps). But this test from What Car? was done in warm weather.
I am not sure if we can take into consideration the EPA numbers for the Tesla 2023 M3LR being that the EPA range is 333 miles, not 358 miles as specified in that pic.