Maybe a mechanic issue.
I own 125 2014 cg. Alhamdulillah.
In lahore it used to give 15kmpl to 25 kmpl average. Bad mechanics.
In my small hometown with imaandar hardworking famous n 20+ yrs experienced japan trained mechanic it gives 45 kmpl. But if i constantly drive it at 70 kmph speed. It gives me 55 km per liter. Talking aBout todays mileage.
Good luck bro finding right guy or right parts.
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