> I'm billed $.07 per kwh. My model 3 LR has a 75 kw battery, so to charge it from totally empty to totally full would cost $5.25 You're assuming 100% charge e

> I'm billed $.07 per kwh. My model 3 LR has a 75 kw battery, so to charge it from totally empty to totally full would cost $5.25 You're assuming 100% charge efficiency. I don't know what your actual home charging efficiency might be, but users seem to be reporting in the 80% to 95% range, with more in the 90s than 80s. So your actual cost could be $5.50 to $6.50. I'd guess that charging efficiency goes down as the battery gets older, but I have no evidence for that. $0.07 per kwh also seems unusually cheap; where I am, costs are closer to $0.15 per kwh. So $11 to $14 per full charge sounds like a more realistic estimate for me, which still beats gas, but not quite as handily.