im not comparing PKDM mehran to any JDM im just sharing what i have seen. my cousin bought brand new Mehran i was with him at delivery time we filled fuel tank at first station approx 28L fuel we filled i guess 2L was already in the tank coze they say mehran got 30L tank . than after a month we refilled tank and again 27.5L fuel and the ODO shows 415km in 27.5L fuel with A/C all the time.
if you calculate 415/27.5=15.09/km avg and no doubt it's very good for PKDM mehran.
btw squezing more hp's from engine does'nt mean it'll give better avg. a freind of mine from track at karachi named Rohab he got JDM kei and got fastest 660cc kei on the track even 1.3l city can't stand with his kei. his kei was producing 100+ hp's and ofcourse avg very bad.
always remember weight to power ratio works if you want avg from any car. and mehran is lighter than any JDM 660cc.
personally i hate mehran peice of **** they made