14 wheels or 16 wheels?

I have 19 diesel 2001 partners on the original cant 14 I go 15 km with 1 liter diesel cant 16 if consumption increases?

If you install a 16 "rim with a suitable tire so that it does not change the total cap, only the tire tread will expand and there will be a slight change in fuel due to the rim weight difference and you will not lose anything.