120v over night will add about 45 miles of range to your typical tesla. Most people drive less than 20 miles a day, so you always start out with a full tank. When I go skiing, I drive 120 miles, so I come back with a lot of range depleted, but it charges up the next few days. On the rare occasions over the past 8 years when I needed to go a long distance, I just use the super charger in my town, although once I went to a pay place that has 220v and 40 amps (so instead of ~3.5 miles of range per house, I added 20 miles of range per hour). What doesn't work with 120v regular power outlet charging? If you drive 250 miles and spend 5 minutes and then need to drive 200 more miles. That is pretty rare.