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I'm blocking my grills for about 90% now, what I see its the temperature rises when driving slow or with the wind rather than fast or against the wind.
Way before the engine temp gets too hot the intake air temp rises dramatically.
I see FE suffer if it rises above 40°C, but cars with no EGR can likely take more heat and still do good.
If I would make my grill block operable I'd switch it by the intake air temp.
EDIT On second thought, then I'd better switch on a fan to draw cool air in to the intake from right behind the grill...
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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.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 03-11-2014 at 06:35 PM..
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