Kia IMT seltos petrol best in MKT for long drive and city

After driving on Himachal hills for two days no problem and very cool driving with my new IMT petrol Kia Seltos 40:60 ratio for driving on hills and plains and AC on plains I got 17.5 mileage with full tank to full tank but the speedo meter was showing mileage of 22.1. Good mileage with a 1500cc car but not good in City only 8-10 KM/L mileage. I was having fever during driving but didn't feel tired after 700 kms driving from one side of Delhi to Shimla, Kufri, Chail and then same return journey. Excellent driving experience. Looks are best in MKT but I feel I should go with diesel 7 DCT fully automatic Seltos which is more fun to drive. My budget was not allowing me for 7 DCT diesel. But I will recommend it to my all friends.