I have a Stealth Model 3. Started with 85% state of charge this morning. Went to work and returned home..I drove 75 miles. Steady driving, no jack rabbit starts, combined highway and local. 75-80 mph on highway for 40 miles. Temperature outside70 degrees, ac set at 70. No heated seats & streaming music. I have 55% state of charge left. I have a model 3, therefore 75kw battery capacity. So, since I used 30% of my 75kw battery I consumed 30% of 75kw which equals 22.5 kw (.3 * 75). My utility company charges me 12 cents per kw. So, my cost to charge 22.5kw (.12 * 22.5) is $2.70. So, cost per mile is 2.70/75 which equals .036 or 3.6 cents. From what I've read, factor a 10% loss in transmitting the power to battery, so add 10% to the cost. Compute 110% of 3.6 cents....3.6*1.1=3.96cents. Average ICE car gets 30mpg. So, if a gal cost $2.50, cost per gallon is 2.5/30=.083 or, 8.3cents per mile. Not too shabby Tesla. But, driving a distance of 75 miles using 30% of my battery, I guess my range is calculated to be 75/30*100=250 miles.