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I think that would depend on how charged the battery is when you park the car and how much it further drains while parked--I really doubt that they would make an appreciable difference while the engine is running.
My other concern is over-charging the battery.
You could probably install an alternator kill-switch and try to figure out how long the car will be parked, how much that would charge the battery, and so how far you could drive and still fully charge while parked.
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