I read your article about this cardboard over the upper grill opening. Please be so kind to send me a pic from this cardboard fixed or taped over your grill.
Did you use it only during wintertime – outside temperature below some – degrees °C – instead of installing an OEM engine block heater from Honda?

Have a nice day

Berne
Junior Member from Grisonia,Switzerland
at centralinsight.net

“Of course, I mentioned a creative use of cardboard. I was looking at the car’s engine bay and realized that the upper grill does basically nothing. I have come to believe that it was a design concession:

Engineers: Here’s the final proposal for the car, sir, it has a .16 Coefficient of Drag (CD).
Lead designer: It looks like the frog prince and Woody Allen’s lovechild. Where’s the grille?
Engineers: It doesn’t need one, all the air travels…..
Lead designer: The grill is the mouth, it needs to have a mouth. All cars have mouths. Nobody wants to drive a car without a mouth.
[Engineers go back the lab, cut a hole in the front of their design and add mirrors, realizing this increases the CD to .25 and commit Seppuku]

So I went outside one day with cardboard and painter’s tape and taped over the upper grill opening. I refilled the tank and went about my commuting. Two weeks later I realized I had increased my tank-MPG by over 3mpg. I scored some plastic from Philip and am going to fabricate a permanent grill-block which doesn’t look like a big blue band-aid.

Of course, this is all assuming we have a calm storm season down here this summer…