The easiest mod to use less energy is to drive less.The easiest mod to get more range is to simply drive slower.
Neither your suggestion nor mine is likely to be welcomed. Fossil fuel addiction is as much a scourage in our country as fentanyl. A neighbor who is rational about most things, drives a 15 MPG pickup and most weekends, takes it on a 500-mile round trip somewhere. On nice weather weekends, he's towing a boat @ 10 MPG and when the boat is in the water, it's burning gallons per hour. In winter, he's hauling two snowmobiles into the mountains.
Then, there's the heli-skiing once or twice a year. The carbon debt load immense, ICE to the airport, kerosene up to Canada, ICE to the mountain base, snowmobile up to the chalet, more kerosene to the top of the mountain. "It's so beautiful, so quiet, so pure up there, it's like you're the only person in the world!" Then, same again carbon footprint to get home. And he'd tell you he is an environmentalist; loves being out in nature.
jack vines, who's burned a lot of fossil fuel over the past seventy-five years, but now drives a Bolt most times.