Sorry my figures have to be metric. Please do the math..
From the moment I bought the car, I was aware that it won't match the figures on the brochure - but I was really upset when it became real.
On the motorway, around 120 km/h, I've never decreased the consumption below 5 lts/100km. And it can be up to 6.5 lts on average in city central. On a complete journey, I've never made up 1000 kms of a single tank - may be 750 kms or so.
The air con is always on, for 4 seasons, I think that might have some effect.