Bro that day i was having discussion with engineermali regarding difference in fuel avg of 1300 cc vs 1500cc, i am not yet able to understand tht how can there be negligible fuel avg cosidering jam packed pakistani roads and max speed limit of 120 even on motor way,had u been talking abt travelling abroad then i would have agreed but dont u think in our traffic where idle running is alot and slow moving traffic is experienced there 1500cc engine will consume more fuel than 1300cc,coz that output is more being wasted than utilized.its same way if we switch on bulb with less wattage and bulb with more wattage in a small 8*8 size room,there less wattage bulb will be enough and bulb with more wattage will be loss of energy,had it been big room then it would have been well utilization of higher wattage bulb,
so similar is the case of movement of our traffic,i believe in that keeping vehicles producing higher hp in slow moving tfc is just loss of energy,coz idle running is more is busy office and school hours,
this is my own point of view,u may put me right if i am wrong