[curmudgeon22]

I wonder how much the footprint for ICE changes based on where the crude was sourced from, eg:

- traditional well in the US

- fracking in the US

- offshore

- Canadian tarsands

Edit: This article has some interesting information on Energy Return on Investment (EROI)

https://www.sciencedirect.com/science/article/pii/S030142151...

[osigurdson]

It seems that for this analysis using the current and projected fuel mix would make the most sense. There is no option at the pump purchase gas made from offshore crude for example.