The grill block was the first thing I did after finding ecomodder. I ran it for two months. I could not say that the block added anything to my mpg because I was doing other things in conjuction with it. I had to take the car for repair after hitting a deer and removed it before taking it to the insurance guy. Didn't want to have to explain it. I've been running 4 months without it and noticed no loss of mpg in fact milage for last tank was 49.3 (started at 32.5). The mpg improved nearly every tank since removing it. Any improvement was small with the block. I seem to be coming to an impass as the last five tanks have all been 48-49 mpg. Maybe a better intrigrated block would help me to break 50. I've been thinking of building one out of spray insulating foam and the shaping it more aerodynamic and painting it to match and adding a belly pan.
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