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R34 Gt25 auto terrible fuel economy


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Hi guys, this is my first post so hopefully I can find some answers. My automatic r34 gt25 is giving me terrible fuel economy and my petrol tank seems too small. A full tank from empty only takes 30L, and from what I’ve read a full tank should be from 50-65L. 25L got me 150km with regular driving. I don’t know what the problem is since I know the tank shouldn’t be that low, faulty gauge maybe?

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Obviously the gauge is faulty.

Hi fuel consumption is most probably borked O2 sensor. Could be damaged exhaust (crushed), blocked cat (unlikely), dirty air filter (highly likely).

You should be able to get 10s driving around in the suburbs in an NA auto.

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  • 1 month later...

Ok I’ve since replaced the oxygen sensor, installed a high flow cat. Fuel efficiency is much better but still somewhat inefficient, a full tank from a quarter above empty is around 40 (wasn’t filling up all the way last time) and I’m getting about 350km.

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