1978 230 Fuel consumption

I am getting about 14.5 Ltr/100km with careful city driving . the needle setting under the Stromberg 175 CDTU Carby is almost all the way in , in order to get reasonable smooth running . There is a " draging " until reaching 3/4 throttle , good power after that . Full throttle position is reached when Acc. pedal touches kick-back switch . Sufaces between Carby & Manifold have been resealed . Any specific info. welcome .