Here is the grill block I just made for my car.
I need some black tape to finish it off. I have been trying to improve my mileage for about 2 months now and can get in the range of 32-34 mpg. I just received my scan gauge and I thought the grill block would be a good place to start. On the 2nd Gen xB the upper grill only showed about 0.5" of radiator the rest was dead space. So I hope the block will have little impact on my coolant temp. After a couple tanks I will report back.