Given that combined cycle natural gas power plants are 60+% efficient based on a HHV of the gas they burn. Transmission losses over high voltage AC lines is 2 to 8% depending on distance. So at worst for a modern gas turbine plant it’s 52% plant to plug efficiency. Then the gross consumption of 250 watt hours per mile. Convert that to btu per mile is 853 btu per mile.
I own a S60 Volvo that gets 30mpg on E10 @114,000 btu per gallon. 3414 btu per kWh for 33.39 kWh per gallon. This is equal to 1113 watt hours per mile or in btu form 3800 btu per mile.
853/52% = 1640btu vs 3800 in raw HHV btus again second law wins every time. In the USA we get 38% from natural gas, 19% from nuclear, and 17% from renewables so it’s a myth that EVs are coal powered the facts show that they would be nearly 75% powered by zero or nearly zero emissions power sources. Gas turbines emit much less NOx, SOx, particulates due to the lean combustion process and mandatory scrubbers at power plants that cannot be used in a ICE engine especially millions of them. My new EV will be 100% powered by my roof panels since they make nearly 130 kWh per day on a sunny day and we get 220 days of full sun per year in North Texas according to the NWS climate data. My home uses at most 50 kWh per day in August with the AC roaring at 68 degrees set point. This means 220 days per year after running my home my panels will have made 80 kWh available to the EV PER DAY that’s 320 miles PER DAY of range 220 days a year.that’s 74000 miles per year of solar driving range from my own roof top. I drive 36000 per year. The Model 3 LR version has a 310 mile range in full summer heat it’s pack is liquid cooled it doesn’t matter if its 100+ outside the pack is climate controlled.