The US isn't flat. Range can vary considerably with climbing into the mountain passes, or in cold weather.
This leaves mostly mountain passes around the Sierra mountains. And by some strange coincidence, they have plenty of superchargers in the vicinity.
The rest of the country can be, to the first order, considered flat. E.g. elevation change between Charlotte and Charleston is mere 300 meters.
It turns out friction and drag are still things. On a pure downhill you would be able to roll, but it's not as good as going down is bad.
I also found that the car did a lot worse rolling down hill than my mini-cooper manual when I just put the clutch in, which got up to hairy speeds. Heck vehicle seemed to have more inbuilt resistance to just rolling than the fire engine I've run down that hill.
Overall I got 90 total miles of range and hit the flat at 10% battery. I was able to get 290 miles driving in seattle with the same vehicle.
And this was during the wintertime, so with a reasonable amount of heating.
For instance, one pedal modes (across manufacturers) tend to much highly favor regenerative breaking over friction brakes. Of the models I've driven such modes often seem to give you better feedback in the sweet spots of the pedal curve when you are just rolling and not braking/accelerating.
Additionally, in my experience rental cars are more likely to be in sports modes when you pick them up (I think some of the rental car places may even do this as policy to make customers happier when they rent them?), and down shifting them to more balanced energy modes (Ford's is called "Engage") can mean a huge difference in practical range.
I have several fun to drive relatively fuel efficient cars that are sunk costs. I work from home, they're just getting old. I have a pickup to go do dirty things like duck hunting.
The ev seems great for driving to work (I work from home) or around town. I was very unimpressed with it's short trip range and efficiency on a hill (whole trip empg was 44). I spent half as much time at the charger as I did driving. I'm sure it'll get better. Much higher charging speed would help a lot (Mach-e is limited to 150). The extended range battery would help.
Any other sub 3.5s 0-60 under 70 evs out there? If you can't tell I don't care about pure efficiency, I care about a fun to drive car that's got better efficiency than an IC and a usable range.
Many EVs are just as fun to drive in "balanced" modes as they are in "sport" modes, but your efficiency goes way up. Rental cars seem to think you want "sport" modes that are more inefficient because you want to rev that 0-60 more than you want better trip range. That's maybe a good way to sell the EV as fun to drive, but it's not a great way to sell the EV as useful for long trips.
The trick is the EVs already offer both experiences in their software (because they can, because that's how they work), you just unfortunately need to learn the manufacturer-specific ways to change driving modes to get the most of what you want out of a rental car rather than what the last customer wanted or what the rental company thinks you want without asking you. (If you want both experiences knowing how and when to change modes is even more critical.)
This involves crossing the Cascades.