And I'm going to weigh in here on temperatures. I don't think 208 degrees is "excessive" by any measure. However, as shotgun suggested, you COULD try reducing the timing, since you're using 91 octane gas in a 93 octane tune. Reducing the timing will probably cause the engine to run a bit cooler, but you don't want to reduce it too much, or you're going to feel a definite loss of power.
And, as 88Racing suggested, I'd monitor the CHT instead of the ECT for the reasons he stated. I have always monitored CHT and normally see around 210 on warm summer days when the engine is not operating under high loads. This is a very normal, and desired temperature for modern engines. Your thermostat is not designed to open until 195 degrees, and then it opens "gradually" to stabilize the coolant temperature in the low 200s region. The CHT and the ECT will actually be quite close when things stabilize.
I'm actually surprised you used to see only 196 before. Personally, I think that's too "cold" for efficient engine operation. The PCM doesn't trigger "fail safe" operation until the CHT reaches 258 degrees, which gives you an idea of what "normal" is.
- Jack
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