The average MPG in the US is around 25mpg[1]. So assuming that 6 kWh of electricity from the grid (big assumption, see below) is used to refine a gallon of gas, then it seems like the math pencils out. Of course the MPG average includes trucks and SUVS, etc, so not a perfect comparison but very much in the ballpark.

Regarding the 6kWh number, I have been having a lot of trouble confirming it. Some stuff I have read says that refineries are major consumers of grid electricity. Others claim that they can produce most of their energy needs from the oil distillates on-site. My best guess is that it probably depends on how old the refinery is, because it seems like the older reports/estimates tend to mention the electricity consumption, whereas the newer ones mention the 'on-site' energy generation/consumption. I think a lot of the energy demand of the refinery is used for heating, so burning the oil distillates would be way more efficient than using grid electricity for that. So, it may just be the case that older refineries are way less efficient than newer ones, and the 'EV vs ICE' comparison depends on how modern the refineries are in your area.

[1] https://www.reuters.com/article/us-autos-emissions/u-s-vehic...