Remove filler plates?

We have a '91 9400 deere we use to run a 20' table on for wheat and soybeans and a 843 head on in corn. My father was told by another farmer to remove the filler plates and it would help reduce power requirements and do a better job in wheat. I just found this fourm and it looks like if anyone would know it would be you guys. Can i leave the filler plates out for all three crops and what are the goods and bads of not having filler plates, any other adjustments i need to make because of the removal of the filler plates? thanks