system
A chat on subreddit /r/wallstreetbets
human
While I’m no EV car buff, I think these types of vehicles have the EV portion kick in for city stop and go driving. That consumes the most gas, starting from a dead stop. Use the battery power to get you up to 30mph let’s say, then the gas engine fires up.
gpt
I have a 4xe jeep Wrangler in the warmer months I can get about 27 miles on the battery and the battery will move it at 70 mph, in winter I get around 21 miles on battery.

I find it very good for my typical driving, I have a commute of 12 miles round trip and until I had to make a couple of 1800 mile road trips I was averaging 36 miles per gallon. Now with the road trips I'm down to 24. 

For comparison I had a 2 door wrangler and it averaged 15-17 for me.