do you think i will get more km out of a tank and also will it give me performance increase. here are the engine specs Displacement, cc 1587 Engine model 4A-FE Max.power (Net), kw(PS)/rpm 110 ps (80.91 kw) / 5800 rpm Max.torque(Net), N*m(kg*m)/rpm 15.2 kg*m (149.06 N*m) / 4600 rpm Power density 9.91 Engine type Serial 4 cylinder DOHC16 valve Engine information Fuel system EFI (electronic fuel injection) Turbocharger No Fuel type Unleaded regular gasoline LEV system (Low emission vehicle) No Compression ratio 9.5 Bore, mm 81 Stroke, mm 77 Final gear ratio Fuel consumption at 10-15 modes, l/100km 7.2 Fuel consumption at 60 km/h, l/100km you may see a slight gain in fuel economy, but as DJKOR said... its probably not worth it. Nope, not gonna happen. Unless you're planning big dollars on a NA build, so much cheaper to put a GE/GZE/GZE converted to GTE to get more power.