Quote:
Originally Posted by Isaac Zachary
This is how I understand it too.
Plus more mass means more weight which means more rolling resistance.
Ideally all cars, with regen or not, would weigh as little as possible. A 1,000lb car will take about 1/6 the energy to accelerate to a particular speed than one that's 6,000lbs. If regen is 80% efficient on the 6,000lb car and the 1,000lb car has zero regen you'd still be using more net energy to accelerate and decelerate the heavier vehicle with regen than the lighter one with no regen.
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When every conceivable engineering consideration is investigated, an optimum mass is found. Everything you can think of, and everything you'd never think of, has already been investigated. It's that simple.