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The mpg gains are going to depend on where you drive, how you drive, what kind of car you drive, and how much air that you block. Let me explain.
if you only drive on the highway, you can block the whole grill and you'll get the best results, reason is, less air drag, faster warm up. now if you drive in the city in stop and go traffic less than 25mph, you won't get much, and will probably loose gas mileage, the reason is, grill block doesn't give you any advantage aerodynamic wise cause you're not going fast enough, and second there isn't enough air going through your radiator so your electric fan will run so much more using energy to keep the car from over heating.
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