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make sure to test on hot days (may not be possible when you want to) and is slow moving/idle situations... and preferably a combination of both... the problem with grillblocks is while they're perfectly fine for normal driving, every once in a while you might get stuck in a que for 10 minuts or so where it's not possible to turn the engine off/on all the time... this is where grillblocks always give me problems.
another thing you might want to look at is where the airbox is connected to... likely the hose will disappear in the front bulkhead and get it's air from the pre grill cavity... blocking this completely might give you an unintentional warm air intake which could aslso decrease FE (if the car coasts longer, but FE is not better/worse, this could be the case)
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