91 mehran with 50 L cylinder , every sunday i take my car on long route from pindi to gujrawala , 210 Km per cylinder , refil at pindi by pass while there is still enough gas left to cover atleast 5 to 8 Km , 91 mehran touches 140 km easily , once i have a chalan on high speeding and the officer told me you are ging on 144km/h ,,,,,,,,but there was many alteration in its carb , cylinder head , intake and exhaust manifolds , applied 80% rule on intake and exhaust manifold ,