[Resolved]  Hyundai i10 Magna 1.2 — gear problem

Hyundai i10 Magna 1.2 — Engine giving abnormal sound when start the car in standing condition

I have bought i-10 Magna 1.2 from OSL Hundai Angul in August 2010.
Problem :
1)Initially this Car given me only 9 to10 KM/Ltr before 1st servicing .After complained they assured me that after 1st service it will show at per.1st service done but problem unsolved.Its again shown 10 KM/Ltr once again.Again I moved to service center than they did somethimg then it shown 13/14 KM/Ltr.
My question If Hundai saying its gives u 19.5 Km/Ltr where its evidence ? Atleast it show 17/18 Km/Ltr.But its not happening in real.Service canter persons not giving proper feedback.

2)Before 2nd service My enginee gives abnormal sound in Idle start condition even if before running.I moved to OSL hundai that my service center Angul,Orissa,India. but they didn't feel any sound but I am unsatisfied.They said me mud flap is rubbing in wheel but that was not issue because in Idle also it has given some humming Sound.
I returned back but this sound increased then day by day.So I went for 2nd service.At checking I found there is sound from enginee but in idle condition when clutcth applied sound getting stopped.So they told me one bearing at clutch has damaged .So they replaced it.Unfortunately I was not at site ,So I donot known what they did.Back home I have checked the car in my home.But surprised I have not seen any change in sound.After asking OSL Hundia Angul,Orissa, they replied me they have changed the bearing.
My question if they changed how the same sound coming form engine ?
3)My fuel tank level indicator is not working properly.When I am feeling full of tank level indicator showing full .But after running 40/50 Km its level is not getting down.After 150 Km its suddenly getting down.My service center people is not agreeing in this matter.They speaking me it happens like this.

Above problem that I am facing within 6 months of purchasing of Car.So Pl I want complete service and help from Hundai for this problem

Regards
Ashok KUmar Panda
Angul,Orissa,India,pin-759122
Mobile number-[protected]/[protected]