It's not only not "not stellar", it's the reason hybrids and EVs have higher city miles than highway. Acceleration takes a lot of energy compared to maintaining speed, and regenerative breaking recaptures most of that for use next time you take off.

It's why hybrids can increase fuel mileage so much without being plugged in. It's huge.

If you're ever driving an EV that has the option to see real time flow of watts (with numbers, not just graphics), watch what it does while taking off, coming to a stop, and cruising at speed (both slower city speeds and higher highway speeds). You'll probably see fifty to a hundred plus kW flow either direction while speeding up and slowing down, and under five while cruising