Emm...if u drive really fast on highway..yes! What i try before with my kancil..if i driving on 60km/h with air cond and without aircond..the different will be 28KM+ with RM20. Mean with aircond..RM20 can go 138KM..without aircond..it can reach 166KM..if driving more than 90KM/h at the same situation..with aircond can reach more far...