See the differences...
Mitsubishi Lancer
Type : SOHC
Cylinder : in-line 4-cylinder, 16-valve
Displacement : 1584 cc
Max Output : 79(106)/6,000kW(PS)/rpm
Max Torque : 142(14.5)/2,750N-m(kg.m)/rpm
Nissan Sunny
Engine type : QG16DE, DOHC 16-valve with CVTC, ETC, 4 cylinder, in-line
Displacement (cc) : 1597
Max. Power : (@ 6000 rpm) 81kW(110 ps)
Max. Torque : (@ 4000 rpm) 148Nm(15.1 kg-m)
Lancer will have a better pick up because Max. Torque comes in earlier at 2750rpm compared to Sunny's at 4000rpm.
High end wise...Sunny's bhp is slightly better by 4 horses...
Fuel comsumption wise...Lancer will win hands down lah....but will also depend on how heavy ur right foot is.
hope this helps.