Thanks, 3D. I used a 700x25c bicycle inner tube to seal the hood gap. I cut it near the valve, sealed both ends by rolling it onto itself and clamping the ends with binder clips. I pumped it up just a bit and laid it along the front, from the backs of the headlights all the way across the front. It has raised my intake air temperature 30-60 degrees from ambient depending on where I am driving (in town vs highway), as the intake snout is right at hood gap level.
As for airflow through the grill, with just the lowest slot open, my coolant temps stay between 190F & 195F while I am driving. After a 70 mile trip I was stopped at a traffic light and the coolant temp went up to 200F, so I turned on the heat and it dropped into the 180s within 10 seconds. I have a scangauge and keep a close eye on these 2 temps.
I'll be doing some traveling for the holiday, and I hope to get some better numbers. I can't get anywhere close to yours, but you give me something to strive for.
Safe travels, everyone.
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View my fuel log 2014 Mirage DE 1.2 manual: 53.1 mpg (US) ... 22.6 km/L ... 4.4 L/100 km ... 63.8 mpg (Imp)