Don't go for Suzuki GD 110 if you are looking for economy: it's a notorious, fuel gulping machine.
As far as its top-speed is concerned, I have been able to munch 95 - 97 km/h out of it on a long stretch of road (on G.T road while going to Gujranwala from Lahore).
However, it has got a splendid, powerful, noise- and vibration-less engine; and a great suspension system.
I hope this information helps you.