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How Can this Be? Model 3 vs. Model Y

I have a 2018 Model 3 LR RWD. I have an order in to get a Model Y LR AWD which should get here in mid April. Here's what I don't understand.

Both of these vehicles have a 75kwh battery. The Model 3 is more efficient (136/123 mpge vs 131/117 mpge) than the Model Y, but yet the range of my Model 3 is 310 miles vs. 326 miles for the Model Y - with the same size battery. How can this be? The link is the comparison between the two at the government fuel economy website.


Jul 28, 2020
It is possible that the MY is able to use more of the 75kwh battery than the M3 which could which could explain the EPA numbers that you are seeing.
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Nov 13, 2019
Quebec City, Canada
The battery capacity has changed I believe, along with various efficiency improvements as others are saying. I don't believe the heatpump has any effect on the EPA value. If you look at how the EPA tests are performed, they're on a dyno simulating a city and a highway drive, a few cycles, then finishing at a steady 55mph until the car cannot hold 55mph anymore. Tests done inside at something like 75F, I believe heating/AC is off during the tests. They also use a "coast down" factor that represents some friction/aero for the final calculation.

You should compare both 3 and Y of a 2021 model year.

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