No. You look like a fool when you empty it.
I have 2 points regarding said topic:
First, if the 150 lbs of reduced weight is going to make or break your survival you probably should not have been in that specific predicament to begin with. Any "benefit" a player may think
being lighter by 150 lbs gives them can be made up by a more seasoned player by using a wee bit of throttle control. In short... do not dot it, you'll simply look retarded.
Secondly, many times I've maneuvered fast and hard and hung in there defensively vs far more agile planes while in an aircraft with a rear gunner, the 110 included. Eventually, they will just park on your 6 O'clock and just hang out waiting for you to blow as much E as you can. When that happens hop in to the rear gun and give them a face full of lead. At minimum you'll damage the engine (oil/radiator), give them a pilot wound, or spook them enough to make them break off the attack for a minute or 2 and that allows you go gain your E back and better yet get your front guns turned on to him. More than once I've been able to accomplish giving them a face full of lead, then break away, and get a kill because of a PW.
Do not discount having those rear guns. The "added wight" fable is hogwash and the being able to blood the nose of a Spit16 or other such crutch plane is quite fun.