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hi, it sounds a bit worse than it should be. When the VLs came out in NZ you had a choice of RB20E or RB30E, apparently the RB30 was more economical because you didnt have to thrash it to get any decent performance out of it. So it may not get as good as you would think for a non-turbo. My Turbo GTS4 gets about 350-400 around town on a tank.

what temp is it running at - i had a car with a stuck thermostat. Didnt warm up real quick and temp fluctuated on the highway - down to cold. New therm gave anoter 40km a tank

Just see where your temp sits.

Run some good injector cleaner (the concentrate) I tnink it is redex (about $12) but soes a lot of tanks.

Clean the AFM with contact cleaner. pump the tyres up.

There the cheap options...

02 sensor could be stuffed like baseliez is saying. you could replace that for about 50 or 60, may be wotrth it - unless you get exhaust gas analysis to see what AFR it is running at idle and part throttle

if temp remains at 1/2 most of the time then your thermo is probably ok.

Other things to change -

fuel filter,

and possibly air filter and spark plugs.

02 sensor more likely though.

I dont think the responsiveness has much to do with it unless you are driving it a lot harder

try some fuel injector cleaner.. I have always been dubious about them, but after replacing everything else, and the o2 sensor.. injector cleaner *seems* to have made the biggest difference.

Gone from about 350 a tank, up to 500 a tank, mix of city and highway driving... all with a bottle of injector cleaner. That is pretty much going from 15L/100km back down to 12L/100km(!). This is on an RB20DET, and I am usually fairly heavy footed.

managed to get 600km (1/2 highway driving) out of R32 gtst sedan with stock rb20det (cat back exhaust and filter panel), so 550km in ceffy is quite possible??

600km was done with never reving it past 3000 rpm, keeping it off boost :rant:

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