if u need best economy with comfort drive in margalla use these gear transactions:
0~15=1st gear
15~35=2nd gear
35~55=3rd gear
55~75=4th gear
75+=5th gear
try to cruise on 70 or 75 km\h, don't accelarate too much and use engine brakes. Also remember not to drive constantly at the edge speed of ur gear no. for long. Frequent gear shifts and low RPM keeps engine reletively cooler, oil could be used for a longer time and most of all keeps ur driving good and healthy. Don't rush, keep kewl and chill ur life . This will help u in gaining economy and helps ur engine to stay healthy.
Regards,
Akif.