Hyundai i10 flaws but no remedy!?

Good day, my friend bought a new car. A Hyundai i10 with the small engine 1.1 (approx. 70hp). It is the absolute basis. And now the defects: 1) No tank filling is enough 350km. Consumption of 9,86l/100km -> when refueling with the disk by hand calculated -> Even after almost 3000km no improvement. Route profile is mainly rural road and some highway. -> Does the consumption still decrease or is there something broken? 2) When starting and starting the engine the engine squeakes. -> W 3) Car is mostly in a heated garage, yet the rear brakes are fixed every morning, so there is a really loud bang on the road. Especially since this happens even when the hand brake is not tightened. ->Is there something wrong? 4) The car stinks during the ride, as the old cars used to have problems with the clutch. Sometimes it is there, sometimes not. -> Clutch defective?? 5)Otherwise, the footroom under the back seat. give tips so that we do not stand in the workshop completely without knowledge. So that the repair of defects can take place quickly! Thank you in advance for your answers! Greeting Bowmore