One full 24oz tank of fuel it's 1 1/2lb+ so you are flying with an extra 1 1/2lb that is not needed and I bet you it would be more fun to fly a lighter plane than a plane with smoke but 1 1/2lb+ heavier!!!
Lighter flies better and it's a lot more fun than having smoke!!!! ?I have done both and I rather not to have smoke,,, mayube on 40% with 150cc of power an extra 1lb or 2lb wouldn't be so bad!!!

But that's just me!!!