autos are for comfort and peace of mind. if your car is underpowered (small engine or running CNG) it will not perform well.
Generally speaking most mechanics will tell you that autos are "fail" in pakistan because they are too stupid to know how to work on them. 90% of the mechanics in PK don't even know how an auto works.
as for your economy and performance issues, manuals have more and shorter ratios generally so they accelerate faster (engine kept in power band) and they can attain a higher gear easier.