what vehicles are you using for this comparison? I was surprised to see that a base model 3 weighs in the same ballpark as a 330i. however, a model s weighs >500 lbs more than a 540i, and there doesn't seem to be anything in the corolla size class that's even close to 3000 lbs.

I suspect that if this is true, it's only because the most popular cars in the US are so large that the battery weight doesn't matter as much.