Hi guys,
I got this fuel consumption data from KIA uk
It is clearly stated that for Rondo 2.0 Petrol with

16" Rim
Urban Drive style= 11.5L/100KM
Extra urban= 6.6L/100KM
Combine=8.4L/100M

15" Rikm
Urban Drive style= 11.7L/100KM
Extra urban= 6.9L/100KM
Combine=8.6L/100M

Source
http://www.kia.co.uk/New-Cars/Range/MPVs/C...cification.aspx

How come Bigger Rim can consume less Petrol then smaller Rim. According to the law of physic, bigger Rim & bigger tyre size will consume MORE fuel.. Can someone explain pls.. TQ

P/S: Will be getting my Rondo Soon, in doubt should i get the Full spec with 16" Rim or Basic spec with 15" Rim..