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Under 10 litres per 100kms should be attainable quite easily in highway conditions. However, you won't get it if your sitting on 120km/h. Car returns great fuel economy around the 90km/h with the auto trans locked up on the highway. Remember the trip computer goes off the tank level, and is not the height of accuracy if your fuel gauge is inaccurate. Also the tank has a strange shape that can trap several litres of fuel in the opposite side to the pump pickup.

at 400km i'm sitting on about 1/8 of a tank in my normal driving routine ( 20% highway with roadworks, 80% city). but on the trip from Rockhampton -> Gold Coast i was smack bang on 10L/100km @120km/h , even with the current 15,000,000 roadworks that are happening on the highway

^^^

Thats shit. You should be running o2 correction fine because your supercharged. If you are gentle on it, it would return decent econ, a little worse than stock.

If you can't get O2 to work, get it retuned with a Uprev, and sell the Fcon. Mine was tuned rich with boost but still never came close to that kind of fuel usage AND I didn't use O2 correction, just road tune.

Ok, 300kms highway and 47km city used 31L. This equated to approximately 8.9L/100km.

Yesterday's cruise used about the same amount and that was 220kms. Was keeping her up in the revs around the mountains though. That equates to 14l/100km. Which is about right when you're almost always sitting at 4-5k rev with heavy braking around sharp turns and powering out of them.

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