Hi all.

Looked around a bit for fuel efficient (big, commercial) airplanes.
The best ones I found were the Tupolev TU-330 and the Antonov AN-70.
They had cruising speeds/fuel consumption of 780-850 km/h and 118-125
g/t-km. Now my question: would lowering the cruising speed to e.g.
300-400 km/h make them more efficient?

Thanks, Jonas