I've one question for Enl and Scott. When others are dramatically reducing weight on their replacements why hasn't BMW?
Same answer as why BMW aren't offering all-LED tail lights or / and LED front blinkers on some cars:
COST SAVING!
Raw alu is more
expensive, alu manipulation (tooling, energy needed etc) is more
expensive, repairing alu parts is more
expensive ... That's why BMW opted for high-strength steel instead for the body-in-white, and invested rather in steel presses & molds, rather going alu. But they are moving on slowly ... new RWD modular platform is reported to use more alu, and some high-end cars will probably also receive CFRP parts.
Why others are reducing the weight more? Because their cars were heavier than BMW cars in general. So, they have to catch up ... yet unfortunately BMW are not keeping the advantage gap but rather staying still.
Btw, who & where exactly is reducing the weight dramatically? Apart from A8 & Jags I can't see any other example here. Yet. Yes, there are some rumors about future products but let's wait to see what exactly will be realized in the end.
Also mind that
brands within large automotive concerns can afford to use more expensive materials & tech due to savings in other departments (eg. engine & platform R&D etc) & due to savings in purchasing due economies of scale.
BMW AG is rather a small automotive company which have to be very smart & careful how to operate to
stay independent: and being highly profitable & having high revenues is keeping them independent.
Btw,
BMW i cars will feature extreme weight reduction of body & chassis. Unfortunately the batteries for eDrive then add significant weight to a light body construction.
But be sure in the future the BMW i tech incl the materials used
will trickle down to core BMW brand models as well. Especially the high-end ones.