Just read the entire thread --- good job.
I'll weigh in with my alternator field switch. I've had one in my 94 Toyota Pickup for 6 years now. I turn off alternator when accelerating/going up hill. Turn it on on coast/stop. I'm still running the stock battery but have to get a new one every two years. Buy the 3or4 year battery then you only have to pay 20 bucks or so to replace after two years. I have not done an A-B-A test on the truck so don't know the numbers. I have had to push start a couple of times when I've forgotten and run too long with it off.
But the biggest problem: Is making sure the switch is in the up position when I park. That way if my wife takes the truck she is not calling me a couple of hours later asking me to come get her because the truck won't start. That has happened twice now in 6 years. I know I haven't saved that much gas.
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