I do like to compare my efficiency while driving my GTPE. I compare it to taking my other car, a Ford Flex EcoBoost, or my previous car that I replaced, a Ford Mustang GT. Unless I'm on a highway, I'm getting between 12 and 15 in Flex. I can eek out 24 to 28 mpg on a long road trip, but to achieve that I'm doing 10% over the speed limit max and not accelerating at all. My Mustang I drove with a lead foot mostly in third and fourth gear rarely using fifth or 6th unless at cruise Gas mileage was 14 to 16 MPG, on the highway I could get 22 to 24, if I was very careful. I'm therefore I typically use the 15 MPG estimate for most trips, and 24 is reserved for road trips in excess of 250. However 95% of my driving is in the 15 MPG range, And that's what I use for almost all my calculations.
I like to run comparisons based on two scenarios, one the amount of kilowatt hours I put back in based on the Ford app, and the other based on my EVSE app. The difference being the overhead, I also factor it any preconditioning electricity used in the second calculation. For my longer trips (30-100 miles round trip) which is a good combination of city and highway in the New York City metro region (essentially commute into the city from the suburbs) using a 15mpg number as that's what I typically would get on that journey, I end up spending a quarter of the amount I would spend paying for gas versus using my alternative ICE car option, strictly by the kilowatt hour. When I factor in the overhead and preconditioning, still is close, And comes in between a quarter and a third as much. This is while enjoying my drive and not worrying about accelerating or breaking, I'm not hypermiling here.
My point is that for charging at home and for most of the trips I make, of any substantial distance, I save between 66 and 75% on the cost of fuel When compared to my Mustang or Flex. I really am not losing any fun compared to my Mustang, although I do miss shifting and the sound (you can't rev an electric cars engine) the math gets even better on very short trips. The efficiency of a gas car on a cold start and short trip of 1 to 3 mi, is abysmal, compared to one kilowatt or less used in electric car for the same trip, assuming no preconditioning. I've seen my trip meter reflect 6 mi to the gallon on a quick run to the store and back. I've been using my MME for the short trips, and I'm really noticing not having to fill up the ICE car as much. The short trips really kill average economy in an ICE car.
While I do think the efficiency on the long trip maybe less, What I save during the year in more than makes up for it. I also know that I got this car in December up in New York and it's been cold, I think a summer arrives I will be getting even better efficiency, and might say even more.
I honestly didn't buy this car to save the environment, I bought it because I needed more room than my Mustang offered, my wife couldn't drive my Mustang because she can't drive a manual, I couldn't drive it in the winter time because of the lack of traction, the government and Ford we're offering me a decent amount of money off my purchase, used car prices are high at the time so The cost to change cars with minimal. I also bought it because the performance numbers were staggering, and I'm still amazed by the power of the acceleration this car has. I did think I would save some money on fuel, I just didn't realize how much. I also didn't realize how much fun this thing would be to drive. I knew it would be good, but every time I get in I'm impressed. I know there are some naysayers out there, who criticized little things but On the whole my experience with this car has been amazing, I really love it, and I find that I can drive it a lot more than my old Mustang, which I used to park up during the winter.
So I agree with almost everything in this post, I think you need to look at the overall savings you achieve every time you drive the car. I am amazed every time I do the calculation on how much I save. I just wish I had got this thing earlier. It just keeps putting smiles on my face, and money back in my pocket. This car has the funniest smiles per mile rating of any car I've had, and I had some great cars.