A partial answer to your question is in the link below:

https://www.eia.gov/tools/faqs/faq.cfm?id=73&t=11

Just on the combustion aspects, natural gas has 51%-55% of the CO2 output of 
coal, per BTU.  Coal CO2 levels vary by the type of coal.

Going into the production aspects would be harder to answer.

Mike

On November 25, 2015 8:59:50 AM MST, Peri Hartman via EV <[email protected]> 
wrote:
>Very nice graphics.  Note that, after coal, natural gas supplies 30%. 
>I 
>wonder what the CO2 output is for natural gas, including fracking and 
>other production steps.  (Sorry, I'm not taking the time to research 
>this right now.)
>
>Regardless of what percentage of current EV owners use solar or wind as
>
>their energy source, that percentage is irrelvant for the future.  Two 
>reasons:
>
>1. If everyone were to buy an EV today, by definition, the percentage
>of 
>owners using wind or solar would be eqivalent to the overall production
>
>of power from wind and solar.
>
>2. Early adopters behave differently from main stream users.
>
>Peri
>
>------ Original Message ------
>From: "Mike Nickerson via EV" <[email protected]>
>To: "Robert Bruninga" <[email protected]>; "Electric Vehicle Discussion
>
>List" <[email protected]>
>Sent: 25-Nov-15 7:51:57 AM
>Subject: Re: [EVDL] Any recent surveys or focus groups of EV owners? 
>(burning coal?)
>
>>You can also do this by examining the local utility fuel source in
>more 
>>detail.  Overall, the U.S. is only 39% coal.  Some states are more, 
>>some less.  Each utility usually has a web page with their numbers.
>>
>>A nice graphic for all states is at:
>>
>>https://www.washingtonpost.com/graphics/national/power-plants/
>>
>>Mike
>>
>>
>>On November 25, 2015 7:53:34 AM MST, Robert Bruninga via EV 
>><[email protected]> wrote:
>>>The most important EV survey needed is how many run thir cars on COAL
>>>versus
>>>how many run on clean energy and what percent
>>>The only studies I found were the 2012 or so one in California that
>>>said
>>>about 47% of EV owners also charged from solr or wind and the recent
>>>Ford
>>>survey that said 85% either use solar or wind or will when their
>>>utility
>>>offers it.
>>>
>>>We need this data to combat the forever "EV's run on coal" argument.
>>>
>>>Bob
>>>
>>>
>>>-----Original Message-----
>>>Subject: Re: [EVDL] Any recent surveys or focus groups of EV owners?
>>>
>>>You can find quite a few of us on https://speakev.com/
>>>       From: Gerald Fittipaldi via EV <[email protected]>
>>>  To: "[email protected]" <[email protected]>
>>>  Sent: Wednesday, 25 November 2015, 1:12
>>>  Subject: [EVDL] Any recent surveys or focus groups of EV owners?
>>>
>>>I'm curious to know if there have been any recent surveys or focus
>>>groups of
>>>people who own EVs, and the results. I'm most interested in how
>people
>>>use
>>>their EVs, their satisfaction in the vehicles, etc. I've tried
>>>googling, but
>>>other than the below Maine survey, I'm coming up empty handed. I
>>>couldn't
>>>spot much on EVDL archives either. Thanks.
>>>http://www.nrcm.org/wp-content/uploads/2013/09/NRCMEVsurveyresults.pdf
>>>
>>>Gerald
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>>
>
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