There was a poster who mentioned that BMW and Bridgestone are working on a stickier tire that after all of the reviews came out which unilaterally cited the tires, particularly the front tires, as the single most limiting factor of handling/performance of the i8. Hopefully that is true and they will have that out soon.
As for a smaller/lighter battery, it's all a balancing act and the smaller the battery, the less power and torque you can squeeze out of the electric motor. The i8 battery is already pretty small.
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