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You wouldn't want to disable the alternator on a road trip. Alternator disabling is best for shorter trips where you won't discharge the battery too much.
Someone else might know if your alternator can be disabled with something as simple as a switch, but my understanding is many of them aren't so easily disabled, so people trick it into thinking the battery is full by sending a ~15v signal to it.
Topping off the battery with a charger will help, but it won't help enough for you to see the fuel savings.
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