Swift that was compared here has wider wheels compared to the Baleno. That will reduce the mileage as there is more friction to overcome. For accurate mileage comparison, you must do it with the stock wheels, unless OFC the Baleno also had the tyres of the same width.
IN DONO SE BADHIYA MILEAGE TO MERI SWIFT NE DI (VXI-2015) 2642 KM CHALI 134 LTR FUEL ME. AUR JISME 4 ADULTS AND 3 BACHE THE ROOF PAR LUGGAGE BHI THA. HILLS BHI ZYADA THI (DELHI TO KASHMIR)
Bhai mere paas swift 2021 h with 23k km driven i was thinking to change with new model but now after watching your video i am confused please suggest me what to do