> over 100 years there have been vast improvements in efficiency in ICEVs. In EVs, the curve is mostly flat.

This may be true, but my family's "daily" ICE vehicle costs us about $0.162/mile to run; our actual daily EV costs about $0.028/mile -- almost one sixth as much. It doesn't matter how much more improvements ICE vehicles achieve, they're not going to catch up to the "mostly flat" EV curve.