I'm new here so I hope I practice forum posting protocol OK. My apologies in advance if I do something dumb. In an attempt to justify my current insanity over the Model 3 to my family and friends that are completely ignorant of all things EV-related, I thought I would create a spreadsheet to calculate the lower operating costs for a Model 3 over an Audi A4, the midsize luxury car I have heard most often mentioned as the 3's target. Check out the snapshot of my preliminary sheet and tell me what you think. All underlined blue values are those I will need to keep editing (as relevant info becomes available, tech evolves and markets change) while those in black get calculated by formulas in the sheet. Please critique it by making me aware of crucial omissions or needed deletions or editions as you find them. Notes: Considering the RWD 70 kWh battery Model S comes in at 3.43 miles per kWh (range divided by battery kWh capacity), I'm starting off with 4.00 miles per kWh for the 3 with its lesser weight and expected advances in battery technology. I have seen some expect more like 4.50 miles per kWh. I intentionally had a no upfront cost, leased Solar City system installed (didn't have the cash needed to buy outright) that has the largest possible output the law permits based on our average usage with the eventual purchase of a Model 3 or S in mind. Although our savings aren't all that great now, I estimate that when I start using the excess power currently output by our system (to get full retail value those excess kWhs instead of a measly rebate of its wholesale value after paying retail like I do now), it will start to pay off. I calculate an avg. kWh rate of 15 cents per over the next 10 years from our solar system and with good diligence in hunting down a good 3rd party supplier each year for my grid juice (since my electric company in NJ is run by utter thieves that charge as much as 24-25 cents per kWh), I'm going with an avg. grid kWh rate of 20 cents per. With a new heater and AC installed last week, the 2300 excess kWhs is a somewhat informed, mathematical, educated guess based on the increased efficiency of each in terms of their usage of kWhs but it likely is the number on this sheet with the greatest margin of error. Everything I have read about the A4 (or the BMW 3 series) suggests they need premium or at least mid grade gasoline. The cost of that will of course yo yo over the next 10 years. Let me know if you think my very crude estimates for oil change and tune-up costs for the ICE car are bogus or about right, too. Thanks in advance for your input. If you'd like a copy of the sheet to adapt to your situation, I suppose I could put the actual Excel file up here in a reply.