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320lbs is a lot of weight, which will offset the gains of not having the alternator on. I'm not sure how much it will offset it by, but the weight will probably be noticeable.
How long is your commute, can you get away with only using one of the batteries?
And yes, that is definitely not right, 3.7A is like 45W, which is about what one headlight draws, let alone the entire car.
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