[QUOTE=GreenHornet;473773]Currently yes but in the future car manufacturers will begin to solve the regenerative braking problem with Boost caps instead of batteries which has all ready started to happen. [QUOTE]
My Fiat (ICE) manages to keep up with electrical consumption using regen only, however, it's battery is charged as soon as it gets home. Saying that the water and vacuum pumps are still mechanically driven.
Capacitors can help, but they get large quite quickly, a 'D' cell sized cap only has as much power in it as 'N' size NiMh.
I also wonder how much energy there actually is available in a typical hypermiller braking event. Unless a light changes on me, I usually only brake from around 16mph.
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They have also started to tackle accessories that have a higher duty cycle like AC with solar panel support. Better window glazing, better cabin insulation, and more efficient design will all help to reduce cabin temp fluctuations.
Burning Petrol period currently is inefficient so we have to be creative and selective in when and how we use the resource for maximum efficiency gain with in an entire system strategy.
GH 
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A whole car roof covered in panels has about enough power to run the ventilation fan, but it's a long way short of the 2-3kW required by the A/C compressor.
I've only seen 'improved' A/C efficiency in HEV/EV's because the economy hit from running the A/C kills economy/ range on those vehicles (more so than an ICE it would seem).
Since the efficiency of HVAC isn't part of the EPA tests, OEM's have little interest in making improvements. Mercedes have had double glazing for at least a decade but it's never made it's way into the companies' more basic models. There's also a fair weight penalty there. Of course you can get thermally efficient glass without double glazing, but it's really only a half measure.