meh, it only turns on after a period when you're barely on the gas. Not when accelerating, at stop lights or anytime that matters. Basically free mpg with no downside. Some of the V8 guys have complained about transmission stutter potentially being linked to moving from v4 to v8 but I haven't felt anything in the V6 like that. I haven't seen any need to disable it for performance since it's default behavior is that it's not active during any times where performance is required.
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