If the fuel is clear of contaminates, then why not put it back in the tank. If you're using a fuel strainer that wasn't clean, then you wouldn't know if the fuel was contaminated with sediment anyway. The GATS fuel testers are good for that because they have a filter.
Then again, I'm the kind of guy who lifts the hose in the fuel station to get the remaining dribbles out when filling my car!