According to the industry lobby Rubber Manufacturers Association, it takes seven gallons of oil to produce one car tire. Simple math tells us that 400,000 Model 3's, with four tires each, means 1,600,000 tires, which works out to 11.2 million gallons of oil required to make all those tires. Add to that the 4.2 million gallons of oil used for the tires on the existing 150,000-car-strong Tesla fleet, and you get 15.4 million gallons of oil total. Double that by what, end of 2017 based on the company's aggressive manufacturing projections? And double it again by end of 2018? Tesla vehicle purchases still require a non-trivial amount of oil. And we haven't even added in snow tires that many owners buy. Or the fact that tires wear out and need to be replaced -- more oil per car. So all of this begs the question: what is Tesla doing to explore alternatives? Surely they know about rubberless tires like the Tweel? Too "weirdmobile" for Elon? (I would agree, but still...) What alternatives are there? Is this an area Tesla should be looking at? Is any other company already doing anything?