I agree. However, unless Tesla changes what it charges for power, which is now around 50c per KWh, I don't think it will be cheap in any way. Of course the price of Diesel fuel matters. But we must admit there is absolutely no reason that Diesel fuel should be $6-7 per gallon.
I know Tesla is claiming 2KWh per mile, but we must remember the purchased power is higher than the used power. We cannot claim $1 per mile, as the purchased power will be about 135% of used power. So, $1.35 per mile might be a good guess. Right in line with $7 per gal Diesel.
I'm very glad Musk said he is a fan of Nuclear power. That's what it is going to take to make this work.
Also of note, they made it 500 miles a large portion as slow as 54-55mph and up to 60 in cruise, but had 4% battery at the end. That's not a reasonable operational point for battery management OR TRAVEL SPEED.