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I agree weight matters but in calculating the opposing forces on a moving vehicle weight only plays into rolling resistance which is (with my metro) ~1/3 of the total opposing force (aero drag=0.5*air density*drag coefficient*frontal area*velocity squared. rolling resistance=Mass*Gravity*tire deformation*cos(1/2 tire radius) ). tire deformation and radius has more influence in the energy required to sustain a given velocity than a few kg weight difference.
power to weight ratio doesn't affect efficiency. a lower power to weight ratio will make you burn more fuel but the efficiency of that process doesn't change. the trick is to accelerate slower as work=mad, if you decrease the acceleration you use less energy.
as far as mass quantities of batteries go most of the longest range EV's right now with Pb-acid batteries are trucks. they basically just fill the bed of the truck with batteries.
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