Just did some math and determined with all the Model S on the road ... 20,000 ... that there are 1,200 fewer gas tanker deliveries to be made per annum? Numbers: tanker 10,000 gallons approx. Model S replaces an ICE burning 20 miles per gallon gallon. 12,000 miles per annum average. 12,000 / 20 = 600 gallons 600 gallons x 20,000 cars. 12,000,000 gallons 12,000,000 gallons , 10000 tanker = 1,200 tankers. This make sense? Then add Leaf's, Roadsters, Volts, etc. double it?