ah ren,
fred brother also stated a good point also la..wat we actually wanna tell you is that.Dun try to transplant first,FC is VERY VERY VERY subjective.So there is not instant and absolute outcome after your new transplanted engine vs ur FC.
As i need to say again FC is very very very subjective.
Wat i can suggest you to do is,
such FC for your 4g13 means that something must be going the wrong way.
If it is carbie,try clean ur carbie,check and tune ur A/F,check if any little stuff that gone wrong.
If injection,try clean the TB,if possible send for an ECU check up session at any proton service centre.
There is alot of factors that contribute to high FC.
1)Dun use oversize tyre,oem one is the best
2)Check your tyre pressure,make sure it is under proper pressure
3)are you having alot of stuff in your car,if yess clear it out.You can refer to darkaccorn bro post above for the spare tyre replacement
4)Overall check for the engine parts,an exp mech will do the job.Any old faulty parts,plz replace it
AND THE MOST IMPORTANT : Your driving pattern!!!!
Jaga ur right foot,dun rev dun hentam,drive unker speed.And drive at your car optimum vehicle speed,normally 80-90,owner's manual will have that.
Others extra
1)open window while driving(normal for us smoking kaki rite?) will actually increase drag,and u r throwing $$ out
2)Dun let ur car idle too long when it come to a stop,it waste ur petrol as well
3)dun warm up ur car,instead the car can warm out onces u drive it..
4)hard accel and hard stop waste ur petrol too
Actually all this you can GOOGLE one.And yes dun be mistaken you MIGHT get a better FC after transplant and MIGHT NOT.
And this is normal human mindset as well,onces you taruk a better engine inside,you wouldn't dun put on heavy weight on your right foot rite?
With the money u budget for a transplant,i reckon you to use that money(might be alot of lesser) to do a overall detail check on your car engine,follow the way to avoid unnecessary fuel wasting.AND,if you want nice FC,prepare just drive slow steady all the time.
Again,you can only get a side when you flip a coint you see..hope you understand.
"I jz want extra power and better FC (at least someone said in this forum his 4G91 is 16cent /km which is much better than my current wira 25cent /km)"
EXTRA POWER NO BETTER FC,4g91 16cent/km is possible if you drive steady(refer to above).I can drive a turbo engine without letting it to boost,and cruise everytime at 80-90,without hard braking and any fancy stuff,If my engine is in a nice condition,i can get a good FC as well,but i ain't going fast or power.
Engine has Input and Output.To make it easier to understand,Input is your fuel/air,output is your exhaust gas and Power generated(in kW,bhp,hp,ps etc).
So you see,our reciprocal engine behave in a way that you put in an amount of Input,there will be the "somewhat" equivalent of output you got(we are talking power here). Bare in mind,alot of ppl also think something like you that "i want power and better FC"..is actually i want the same/less Input but more Output(power),impossible dude,if possible,you actually go against thermodynamic law.What you heard or see is,something has been made to increase the effieciency of the engine,so you get the suppose output with the suppose input for your engine.When ur engine is efficient,hence appropriate power and resonable FC. If someone said,do this and that you get power and reduce FC.Bare in mind,they are making your engine more efficient.The effieciency of an engine is fixed OEM(there is formula to calculate it),most of the time due to some other factor,efficiency will reduce .
Duno you understand or not,but when u try to read up some physics and google with the proper keyword,you will get the answer.Hope this help.
