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I'd suggest not looking to the grill block as a panacea. Some people seem to think that a grill block will make obvious improvements immediately, and that's a lot to ask of a little cardboard and tape. And basing "failure" on one day's driving just doesn't make sense.
Understand that it's not about "blocking the grill", it's about "improving aerodynamics". Cover the entire grill, and make it as smooth as possible, but know that modifying your driving habits will have a much bigger effect on fuel economy than a cardboard grill block, and you need to sustain any changes you make for longer than a day.
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