A bit off topic but if you really want to get rid of alternator drag but still have your car make electricity to charge the battery a bunch of these might be a good idea
Taihuaxing Thermoelectric Power Module
You would still need to charge your battery by the looks but at least your ignition and possibly lights could be run off the heat of your engine being cooled by the outside air. This would only charge the battery if you have enough modules and a long enough drive time but I think it is a step in the right direction, now if I could figure out a way of making this produce usable power for an EV?