Slow EV Mode Effecting MPG?

I recently purchased a 2013 Prius with 24k miles on it. I live in Socal where the temperature is temperate all year round. I'm only getting 38 MPG on side streets and can get up to 46 MPG on the freeway.

My concerns:
I notice that when I release the gas pedal when moving (coasting), my MPG indicator shows very low MPG, maybe 2-5 when just coasting. My other Prius (2015) will usually show the indicator at 100 when doing this. Is this normal for a 2013?

The EV mode randomly turns on. When coasting on the streets I barely hit the gas so the HSI goes into the first area (EV area) but the EV doesn't always turn on even though the battery indicator might be 70% full. A few minutes later the EV light will show up, and later disappear even though the battery indicator is the same. I feel like my car is running primarily on gas when using side streets and rarely switches to EV.

I want to try and troubleshoot this issue before taking it to the dealer. Any suggestions?