How Dirty is Your EV? (I’m Not Getting How This Tool Works)

How Dirty is Your EV? (I’m Not Getting How This Tool Works)

https://reddit.com/r/electricvehicles/comments/x965jv/how_dirty_is_your_ev_im_not_getting_how_this_tool/
mmyers300
https://www.reddit.com/r/electricvehicles/comments/x965jv/how_dirty_is_your_ev_im_not_getting_how_this_tool/


Seems like a great tool to compare how dirty an EV is compared to an ICE car, but it’s giving the opposite results of what I would expect.

If you haven’t used/seen the tool before, it is here: [https://evtool.ucsusa.org/](https://evtool.ucsusa.org/)

So using the NEI site to tell me what the sources of electric generation are per state: [https://www.nei.org/resources/statistics/state-electricity-generation-fuel-shares](https://www.nei.org/resources/statistics/state-electricity-generation-fuel-shares)

If I were to compare Kansas (45% wind, 15% nuclear, 34% coal), with Kentucky (0% wind, 71% coal, 21% natural gas) I would expect to see Kansas with a much higher MPG CO2e, but instead, I see the opposite. I used a 2019 Tesla 3 Long Range AWD.

Kansas zip 66113, MPG CO2e=74

Kentucky zip 40475, MPG CO2e=82

Would someone please tell me what I am missing?

According to their tool:

## What is MPG-CO2e?

Shorthand for “miles-per-gallon carbon dioxide equivalent,” MPG-CO2e is a standard way to understand and compare emissions from electric vehicles. Specifically, it is the fuel economy a gas-powered car would have to achieve to generate an equivalent amount of pollution. A higher MPG-CO2e = less global warming pollution.



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6 thoughts on “How Dirty is Your EV? (I’m Not Getting How This Tool Works)

  1. Hmm I checked the Federal gov calculator and got similar results:

    https://www.fueleconomy.gov/feg/Find.do?action=bt2

    According to the federal gov Kansas is much greener than Kentucky like you say:

    https://www.eia.gov/state/

    My guess is that the region of Kansas you typed in locally gets more power from coal than the region of Kentucky you typed in, even though statewide Kansas is greener. You can try different places in those states and see if you get different results. The reason they ask for a ZIP code instead of just your state is so they can tell you based on the local grid. Both are much less than the emissions of ICE though so they’re both good!

  2. where does the fuel come from?

    ​

    **For more details on our methodology**—or to learn more about electric vehicles—read our FAQ.

    ​

    https://www.ucsusa.org/resources/ev-emissions-tool-faq

    To calculate CO2e emissions from gasoline-powered cars, the CO2e of tailpipe emissions is added to ***emissions from producing and transporting gasoline.*** We use data from the GREET model (Argonne National Laboratory) to calculate the emissions from extracting crude oil, transport to a refinery, conversion to gasoline, delivery to a filling station, and burning in a car engine.

  3. you know that wind is really, really good, right? And nuclear is even better?

    I would expect kansas to be better than kentucky because coal.

    ​

    oh, this is one of those ways that americans are weird. mpg instead of the much better l/km

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