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      09-21-2021, 08:22 AM   #82
ZCD1
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Drives: 2018 Tesla Model 3 Performance
Join Date: Feb 2012
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Back to the OP's question - this is a likely scenario:

1) BMW using a shared architecture for the platform means the architecture is NOT optimized for EV use.
2) This means that the platform is heavier than it would likely otherwise have needed to be.
3) Like all of the legacy Euro brands, BMW is not developing its own EV drivetrain in house from scratch. This likely means that it's not optimized for use in this vehicle (see Lucid, Tesla for examples of such optimization).
4) Heavier weight and lack of optimization means the platform is less efficient overall than dedicated EVs.
5) Less efficient + heavy weight means a bigger, heavier battery is required to achieve competitive range.
6) Result: - I4 (and all of the other shared-platform EVs currently on offer) are overweight by comparison with dedicated EVs.

Jason Cammisa explained the difference in EV design approach quite succinctly back in 2019:

https://www.roadandtrack.com/car-cul...ore-than-ever/
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