Just ran on to your question today. My electric cost is $6.00 per KWhr, but has increased some since I did calculation.
2002 e825 short bed- 3600 miles. 7.5 hp, supercharger, 14 in tires- 40 mph w/ Trojan fla.
2016 GEM E4 - AC conversation- Tesla battery. 300 miles
2016 Tesla Model S - 20K miles
2018 Tesla Model 3 - 34K miles
Just purchased a 2002 E825 with 4,525 miles on it.
Tesla 356 miles. I will update more after todays trip