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I think your Festiva has a single wire plug on it. You could just wire up a single toggle switch to turn it off. I have done this in my S10, and I watch the Scanguage to determine when the battery is low enough to warrant kicking back on (or when I'm coasting for a distance with the engine on to decelerate). It is probably only worth about 1 mpg on my rig...might be more on your Festiva.
From a full charge, I can go 80-100 miles before I drop below 11.8 volts. This is with a 2 year old starter battery, no vent or lights on. Just the radio running at moderate volume. I will replace this battery with an AGM (probably blue top Optima) marine one.
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