Except engine sound nano is very good

hai my name is raghavan.we got nano in september.The car good in style.we traveled in our car at a time nellore to chittor(150km).There is no inconvenience to travel.but if we want to sit 5 people it will be  discomfort.a/c is very good than any car in india.normally we won't feel any heat in car but if  we touch the bottom of the rear seat we can feel heat.engine noise is very much problem.if we hear it from outside it is like tata ace auto.except this we can't find any other problem.it is giving 21km/lit in city and 25km/lit on highway without a/c
           thanks for giving this opportunity ..........bye