Remember that its fuel average is not good, there are many factors, including its shape which is not aerodynamic and gear ratios are not like other city cars.
You will not get higher than 10km/L max average out of it, and if you insist to make it better, mechanics will fool you with useless hacks.
I bought mine because my plans are for off roading, traveling on unpaved roads, climbing hills etc. Finalize what purpose you want it for, then make decision.
Good luck and best wishes,