I want to be able to state the mileage of my new Model 3 in terms of distance per electron. Maybe it will turn out to be 103 angstroms per electron, or a quarter of an angstrom per electron. Again, I am well aware that this is really meaningless for several reasons. The number of electrons is only meaningful if the voltage is also stated. And I know that electrons are not stored in the car. Electrons flow through the battery, causing chemicals to change to a higher chemical potential energy. But I'm being silly and I think this is a fun game.

So, I charge at 240 volts and 40 amps. I figure that I get about 30 miles of range for each hour of charging. Since I'm only counting electrons, we can forget about the voltage. (It matters if we were trying to calculate energy, but I'm just counting electrons, and my electrons are at 240 volts.) One ampere is one coulomb (6.25X10^18 electrons) per second. So in one hour of charging I get 3600 times 6.25X10^18 electrons, or 2.25X10^22 electrons. That gets me 30 miles, so 7.5X10^20 electrons gets me one mile. Now I get onto shaky ground. There are 1.609X10^13 angstroms per mile. So I come up with 46,612,803 electrons per angstrom, or, rounding a bit, I get one fifty-millionth of an angstrom per electron.

Did I do this right?

Every once in a while someone still asks me what my gas mileage is when they see my Roadster. More people know about Tesla now, but if people notice the Model 3 at all, some won't know what it is. And just every now and then, after I tell someone my car is electric, they'll still ask what my gas mileage is. Instead of "As I already told you, it doesn't use gas. It uses electricity and it gets 4 miles per kWh," I like to say something like "It gets a billionth of a trillionth of a mile per electron." Or, "It gets one fifty-billionth of an angstrom per electron."

Sadly, there doesn't seem to be a standard unit of distance small enough to say, "It gets 250 octobetylmeters per electron."