ok this is how i am calculating the average.
suppose i put rs.500 gas there fore 500/62(petrol rate)=8.0 litres
and suppose the car does 90km before the petrol finishes , then 90/8=11.25
now i doubt a 1.8 can do 90km on rs500. so guys plz recheck the formula and then report back plz.....
and plz mention auto or manual... also andrim size thanks to all