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A comment on Volkswagen enters battery business with $20B investment. Parent comment

Re:Volkswagen enters battery business with $20B investment by anon_123g987 on Thursday July 14, 2022 @07:52AM (#32094692)
"20 MPG is about 0.1 square millimeters," according to https://what-if.xkcd.com/11/. "If you took all the gas you burned on a trip and stretched it out into a thin tube along your route, 0.1 square millimeters would be the cross-sectional area of that tube."

It's simple dimensional analysis (https://xkcd.com/687/).

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