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Originally Posted by Angelus359
I was wondering if a grillblock behind the plastic grill would be effective?
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They're still effective - most car manufacturers use them nowadays to block their unnecessarily huge grilles.
It'd be a lot better if they dumped those fake grilles alltogether and go for a smooth front.
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All the grillblocks I've seen online go infront of the grill.
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That's often the easiest way, though not always the most visually appealing.
Other folks run blocks behind the grille, some have filled in the space between the grille frames.
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I'm talking about blocking 1-2 inches behind the plastic grill, but several inches infront of the radiator.
I just made a trial grillblock out of ductape and cardboard, and placed it back there...
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It should work, though it will probably work a bit better when you move it nearer the grille (less air seeping through other gaps).
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I have no real way of testing it.
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If you often do the same stretch of road at the same speed, you know what FE to expect.
Over time, it'll also show up in your long-term FE numbers.