150 miles range (rounded for easy math) minus 1/3 capacity for staying in 10%-80% limits is 100 miles range. Minus 1/3 capacity for hot/cold/heater/a/c is 67 miles range. I average 9-10 miles per day. My long drive would be into town to daughter's house, 6x miles round trip. Oh no! So I'd just charge to 100% the night before and be set, no problem. Or I'd head there with 80% charge if it was a surprise unplanned visit and on arrival plug my portable cord into her garage and add a bit until leaving for home. Either way I believe with the major cushions I'd be good for more than a decade with one. But at only ~300 mi. monthly the savings aren't enough to warrant switching over. At $19,959 plus TTL it is a tempting car though.