One effect I noticed from blocking my grill is that the engine stays warmer for longer when parked. Even after 4 hours the engine is noticeably warmer than ambient.
Simply because it more or less closes off the engine bay so the warmed air in the engine bay cannot escape that easily
Warmup times are indeed faster - but not by much.
You need to measure the temperature. I already had to reduce some grill blocking.
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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.
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