Ace,I strongly believe its not the fuel filter that is eating up the petrol. Usually it will give you slight jerk or engine cut off (worst case). You should get your engine tune up and check out your exhaust including the header for any leak. This is the major fuel burner when the exhaust is leaked.
I am driving GK (previous owner also HCC ZTH member). I did a injector cleaner by wynn (cost about 200), spark plugs changed, ATF, normal air filter, semi syn engine oil changed and my FC improve significantly. Now is about 0.2 cent per km KL city drive. Not much to complaint coz 2.0 auto engine cant aspect so muchi know this thread has been quite dead for quite some time but i really need some enlightenment from all the sifu's...i got my rd2 lately....its an 1.6l auto...n guess what...my fc is also crazily high....rm50 can only bring me bout 180km city driving....tested this for a few refuel of rm50 and it still gives the same figure...did my oil change and air filter changed...spark plugs are running fine but suspected plug cables arent too good in condition as it is taped wit wire tape...bought a replacement but yet to change cuz the one i got was too short...was even thinking of using injector cleaner to clean the fuel line...what else could i do to fix this??? i dun wanna sell my coupe yet as i'm enjoying the car...but the fc is really a burden especially for a student like me....=( pls help!
---------- Post added at 11:06 PM ---------- 6 hour anti-bump limit - Previous post was at 11:04 PM ----------
btw its running on 16" not the stock rims...plus the tyres were a lil hardened and there's crack lines...yet to change...does the tyres affect the fc that badly? or could it be the gearbox? cuz i noticed slight vibration on 3rd gear...other gears are fine...