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All I know is you want neither the coolest nor the hottest thermostat under the hood, neither of those are meant for any situation except one that specifically calls for it.
On some older cars it has been known the cooler thermostat extends engine life at the cost of some minor mpg loss yes, but the hottest one is as likely to create strains and pressures that may result in premature failure of hoses and pumps and whatever else could go, because as temps increase so does psi.
That having been said I think on most vehicles the second hottest should do well, but I wouldn't push it beyond this.
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