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Two things. First, definitely leave a hole in the belly pan for engine air to escape. I have mine starting at the back edge of the radiator, extending back about 12-18 inches, and the opening is 18-24 inches wide. I do not have a full pan, just the beginning of one under the front. In our desert heat, there is a ton of air that is being pushed and pulled into the engine bay through the radiator and AC condenser coils. All that air needs an easy escape route.
Second, one of the major sources of "drag" is the AC compressor. I lose 1-2 mpg in the summer because of this. Just keep it in mind when looking at your numbers and where you want to get to...since not using it is not an option (in my opinion). Good luck! :-)
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