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I like your approach, but my gut tells me you'll be replacing batteries much more often. Maybe often enough to reverse any economic gain from a small increase in FE...
my racecar has a 'total loss' electrical systems, meaning no alternators at all. We'd only charge the racecar battery before race day, then at the track after a few rounds. I'd trickle charge it every 6 weeks or so, during the off season. When battery voltage drops below 11.2v or so, the MSD ignition box delivers an intermitent signal, the engine misfires as a result, so having a battery in great condition was always very important. Sounds like you have that covered with two batteryies.
The standard lead-acid automotive grade car batteries I used would only last 2 years tops, but I'd replace them after one season (10-12 races when we were hitting it hard), relagating last years battery to trailer duty, where I was usually able to get another season out of it.
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