The Hyundai Ioniq is a similarly shaped EV as the Model 3, and it gets very similar numbers - 133 MPGe (Ioniq) versus 141 MPGe for the best version of the Model 3 Standard Range
The Ioniq has substantially less range than the Model 3, and is a much smaller car. If the Model 3 still gets slightly better MPGe despite those differences, I'd say Tesla still has a pretty significant efficiency advantage in this comparison.