Not to mention the "sudden" difference in gas formulations.
I installed the battery disconnect late last year and have seen no ill effects from it. I'm also running both engines about once a week. In the dead cold of winter I would run the V-10 for a good 30 minutes or so--at least until it was up to operating temperatures. Over the course of winter I burned about 1/4 tank doing this.
The couple of times I've driven it after extended storage and disconnecting the battery I have not noticed any difference in behavior/shifting patterns/etc.
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