Engine noise is high due to small engine.
Engine head shield bhi nai di hui although its a head shield lekin it make a noise difference.
Seghal motors has some desi heat shield for engine bay/hood inner lining
you can use that thori bohat awaz kam ho gaye gi
Average is toooooooo low get your car checked from suzuki.
Avg should be minimum 15-17 even if you have a very heavy foot warna 20+
mine is giving 21
long pe 23
Have you changed the oil or not