[SoftwareMaven]

Until fast-charge batteries are a reality (such as the carbon-laced Li-ion discussed previously here), people very much will mind their car being at 20% charge. That means they don't get to drive until the next day, except 5-7pm is key commuting time, when they need to drive now.

[reitzensteinm]

My proposal was not that people would sacrifice 80% of their battery. The first half was exploring the limits of the idea. I was suggesting 20-40%.