I'd treat a hotter thermostat as a slight, unquantifiable gain. The theory's all there, but it's just not something that I'd expect to actually be able to see in my gas logs.
Sure you may see a difference if you bump up the temps a few hundred degrees, but at only +10º you aren't likely to see much.
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"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.
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