For those of you with 02 and 03 1800's that started experiencing bad gas milage all of a sudden, you may want to check the fuel pressure regulator.
I was told by the guy that dynoed my bike that he has started seeing quite a few vtxs coming in that had bad regulators. What happens is the diaphram in the regulator gets a tear/split in it.
The way to check it is to run the bike to operation temperature, turn it off and then pull the vacuum line off the Fuel Pressure Regulator. If vacumm line is wet inside (gas), you have a bad regulaor.
Mine was ok, but I'll be checking it from time to time.
Bill