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Check your air intake temperature.
During a mild frost period I ran with just a lower grill block and the air intake snorkel detached, so it would generally draw air from the radiator rather than the upper grille.
The intake air was cold and stable for the first 10 kilometers, then the thermostat would open flow to the radiator and it would very gradually climb to ambient, then at 30 kilometers it suddenly went through the roof, raising one degree every 4 seconds!
It ran to well over 50 Celsius and I would have stopped to reattach the snorkel if not for hitting the off ramp right then,which cooled it back a bit.
Also I noticed a drop in economy going above 35 Celsius. My car has EGR; I bet it needs cool air to function properly.
I used a cheap digital in/out temperature sensor with the out feeler in the intake nozzle at the time. Nowadays I read intake temp on my UltraGauge.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
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