my liana lxi cng consumption is good like 180 km on long but its petrol avg is worse,around 7 to 8 km/l,i have taken it to adil zafar motors,3s,they said ur car tapets are tight,and liana dont have adjustable tapets u need to do whole head job done,they gave me estimate of around 50k,and i said i m happy with that consumption.my car is 85k driven,what u guys suggest me