A single Big Mac can power a gaming PC for 2 hours, a Tesla for ~2.5 miles, or a moderately active human for 6 hours.

It could also take an e bike anywhere from 25-50 miles depending on the rider, terrain, and other factors.

I don't know if I'd say we're "inefficient"...but we also don't carry around 1000lbs of batteries...even in America.