Isn't that crazy efficient? I seem to remember about 0.3mm²?

Way back of you asked Google "38 mpg in mm^-2" it would tell you.

I love that it's the size of the thread of fuel you would consume as you drive down the road.

Edit: oh no, that's about right. It's a diameter of about 0.25 mm. I think that's what I was thinking of.