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Originally Posted by redpoint5
Is that a real University?
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Yes, Chalmers is a real (and well-known) university in Goteborg, Sweden. I've been there; my master's advisor was director of the GOArt organ building research department at Chalmers.
The paper argues that their models predict close to the same efficiency (as a % of total energy put in) for large vs medium vs small BEV (*on the urban cycle only*) but
increased total energy consumption for heavier BEV, as one would expect. The claim that "BEV and ICE diverge" is quite correct according to this modeling, but not because BEV are more efficient as they get heavier but
less, while ICE are more efficient with increased weight because the engines work at higher load and better BSFC:
And the authors note that, for the ICE model,
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even though a higher efficiency is achieved with increased weight, a heavier car still consumes more energy, as earlier explained.
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That is
very different than claiming there is a "sweet spot at which overall optimum efficiency is achieved," as aerohead has used that to argue that increased weight of BEV isn't a detriment and may be a good thing. This paper doesn't show that. That's his own idea which he is attributing to another source to give it credibility.