The Vios isn't that much more efficient than the Lancer. I only get 8-9 km/L in city driving. Dips to the 7-ish range when traffic's really heavy.

Highway consumption is great at 16 km/L when traveling at 100-120. Not sure if the Lancer can also do this, but it shouldn't be that far off.

The Vios is still a very vanilla car though. A great basic car, but still very appliance-like. The Lancer could bring more smiles to you, especially as FC isn't that far off.