Q. Does it have automatic gear system - Ignis?

It has got AMT (Automated Manual Transmission) in all the variants except base model. It offers very comfortable ride in thick traffic as well as highways. The mileage economy is very encouraging with not less than 21 km per litre in highways. Often it will be 23 if you drive early hours in the morning. However in city don't expect above 15.

Having but not suggestible in the point of mileage and life and ride highways for long run

Ignis has an AMT system and not a proper automatic transmission (CVT, DCT). It is a good system for easy drive-ability in the city traffic, especially.