my grill is set up for lp gas but marked with a NG on its serial sticker. when cooking i seem to use alot of lp gas (5 hour cooking with 4 burners on 3/4 tank)and not observing alot of flame action as you would think from the gas usage. is there something wrong with my grill or wasn't it converted right. plse help me understand signed greg at 4103829339 or email grob820010@aol.com.