An EC engine is a long way from 100% efficient. Model 3 Long Range is 310 mile range on a 75kWh battery. Cars are not hitting 310 miles on 2.3 gallons of fuel.

For the most extreme comparison, a Bugatti Chiron gets an EPA 11 MPG so the roadster is arguably the equivalent of a 56 gallon fuel tank where the Chiron is stuck with 26 gallons.

PS: A better comparison would be a similar ~200,000$ two seater but none of them are optimized for fuel efficiency.