I have found a measurement I like a lot better than MPG/MPGe. I call it MP$ - miles per $1.00. For example ... our 22 Corsair usually take about 11kwh to charge fully (100%). Our electricity rate is $.083/kwh. So, rounding things off to $1 per 11kwh, I get about 25 miles per $1.00 of "fuel".
When I run solely on gas (like when we were told not to charge as part of the initial battery recall), we get about 30MPG ... so, at ~$4/gallon here in Washington state, that works out to about 7.5 miles per $1.00 of fuel.
So, we try to run on battery most of the time whenever we can. For example, I just filled up on 21 December with 10 gal of gas. My previous fillip was around the 1st of October.
Must say, the savings really mount up when using a full EV like our F-150 Lightning!! I'm currently running about 80-90 miles or so per $10 of electricity vs ~5 miles per dollar of gas (which is what I was running on our '22 F-150 V-6!!)
Ken