95% of the time I'm charging at home and on a net-metering Solar plan, so really only paying those $0.12/kWh rates in the dark winter months, basically charging for "free" off solar once we hit the equinox.
What does matter more than price to me is the speed of the fast charging experience when I'm on a road trip. Tesla is not perfect -- I've been to chargers located in mall parking lots, which are an absolute nightmare in the holiday shopping season. I've been to chargers in airport parking garages, where you need to pay to enter the garage, etc. Most of Tesla's newer locations are better than this (like the ones at Sheetz gas stations just off the highway). But whats a real nightmare for me (and which has never happened to me with Tesla) is most of the chargers being down, or running at severely degraded speeds. This DOES happen with EA. So after hearing terrible charging experiences from friends with CCS cars, I'm pretty much tied to the Tesla supercharger network.
>In general, the cost of charging a Tesla is more than 3 times cheaper per mile than the cost of fueling a gas-powered car (4.56 cents per mile compared to approximately 13.73 cents per mile for gas vehicles). from: https://news.energysage.com/tesla-charging-cost-vs-gas/
a different take: >It depends on what you are comparing it to gas wise. In my area, approximate numbers are 11 cents a kWh at home, 28 cent at a SC. I will get roughly 3 miles to the kWh so a mile costs me 9 cents if I SC. Gas is $3.30 a gallon so my car would need to get 36 miles to the gallon or better to compete with SC'ing.
You do have to be a little careful if you want to go that route though, Tesla has pulled free supercharging from some vehicles, and some had the free supercharging limited to just one owner. Also, Tesla is trying to entice people with the free supercharging to give it up, I believe the deal is $5k off a new Tesla if you give up free SC.
Assuming 4 miles/kWh, that's $36 to drive 400 miles. Charging at home cuts the cost roughly in half. These numbers vary depending on location.
But if I did have to pay, I believe my apartment charges $0.30 per kWh. And I get 4.5 miles of range per kWh. So it's $6 to drive 100 miles. Gas is over $4/gallon here so a car that gets 33 mpg would spend over $12 to go 100 miles.
If I was paying $0.125 per kWh like I've seen other people report in this thread then I'd spend $2.50 to go 100 miles.
Just looked it up: $0.45/kWh the last 4 times at Tesla Superchargers in California.