this post was submitted on 04 Aug 2023
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Let's also not forget that this issue applied to ICE vehicles as well for decades. The EPA city/highway MPG ratings were always way higher on paper than in practice until they reformulated their testing several years back to give more accurate numbers.
Do you have a source for the reformulation? I’m newer in industry and don’t remember a reformulation. I’d be interested to know more
https://www.epa.gov/fueleconomy/basic-information-fuel-economy-labeling#:~:text=Updates%20to%20Fuel%20Economy%20Test%20Methods%20and%20Calculations&text=The%202008%20changes%20were%20broad,small%20number%20by%202%20MPG.