Here's the problem with this though: you're comparing producing electricity to running an ICE. They aren't at all the same thing.
If you want to fairly compare the two, you need to look at at least the following four things:
1 - Producing electricity.
2 - Getting that electricity to drive a car forward.
3 - Producing gasoline.
4 - Getting that gasoline to drive a car forward.
#3 is something that any study like this completely ignores. Here's a fun fact: producing 1 gallon of gas consumes 6 kWh of electricity. That one gallon of gas will then drive the typical car approximately 20 miles while spewing emissions along the way. Alternatively, 6 kWh of electricity could be used to drive an electric car 20 miles - no emissions at all.
So, in fact, when you look at an electric car, you just need to factor in #1 and #2. When you look at an ICE car, you need to look at #1, #3, and #4. #1 is in both, so don't bother looking at it any longer. You just need to compare #2 against #3 and #4, and #3 is going to involve somehow extracting oil from the ground.
Whether you choose Coal or Solar for #1, it doesn't matter - an electric car is in every way better than an ICE when it comes to emissions and health.