Yes, the best way to
Yes, the best way to determine is not a normal metric such as that if MPGs. In reality, because it is Plug-in Hybrid, there is a choice between EV or HV, which can skew the MPG calculation. Cents per mile converted from cost per gal/kWh let's potential buyers know if using gas is cheaper than electric. In my case, charging after midnight while it's at the cheapest rate, is appx 3-4 cents per mile. Whereas gas ($4.65 gal) is appx 12.5 cents. I never charge outside of super off peak hours and I try to use up all electric before using any gas. With a 48 mile commute round trip, I use appx 8 miles on ICE daily. So far my tank is on pace to be 2800 miles before a fill up is needed. Everyones results will vary greatly depending on speed, weather and terrain.