Unless you are in truly awful stoplight-to-stoplight traffic, it shouldn't be as low as you're getting, especially with the CVT. According to the onboard computer, I got about 30 MPG on my city commute in DC, and that's on a 2019 with the old 6-speed automatic. My partner, however, only gets about 23 MPG on his shorter city commute, so it's not impossible! 