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What is Tesla's mpg if fossil fuel is used to make electricity?

So many people think it's pointless to get an EV, since we get most of our electricity from fossil fuels in the USA. I think this is incorrect, and I explain why below. Let's get some stats first. https://www.eia.gov/tools/faqs/faq.php?id=427&t=3 In the USA as a whole, electricity comes from the following sources: 60% from fossil fuels 18% from nuclear 22% from renewable sources What is Tesla's "gas mileage" if electricity comes from fossil fuels only? According to this federal agency ( https://www.eia.gov/tools/faqs/faq.php?id=667&t=6 ): A gas turbine power plant produces 12.90 kWh/gallon of gasoline. A Tesla model Y uses ~284 Wh/mile. Therefore, a Tesla Y gets 45.4 miles per gallon of gasoline. Since there are small losses during charging and electric motors are not 100% efficient, let's say this is 40 mpg. Since 40% of the US electricity comes from non CO2-producing sources, we need to add 27 mpg to the gasoline mileage only. Therefore, the total