I'm not so sure that's true. Today's ICE vehicles have very tight emission limits that require catalytic converters. I dont think the same limits apply to stationary point source emissions.Based on your post, it is a 33% step up!
Not to mention that the power generation plants will pollute less than the vehicles.
As for nat gas plants being cleaner so would not gas powered vehicles and they provide many other benefits as well.
Typical "Green" proponents only talk about carbon footprint and ignore other hazardous materials.
"They (power plants) emit harmful pollutants, including mercury, non-mercury metallic toxics, acid gases, and organic air toxics such as dioxin. Power plants are currently the dominant emitters of mercury (50 percent), acid gases (over 75 percent) and many toxic metals (20-60 percent) in the United States."
Above doesn't include hazardous materials generated / released in the mining & battery manuf processes.
I'm not anti green but wish there was a balanced analysis that considered the total life cycle and considered all hazards not just a slanted view of carbon only.