I am currently getting 28 mpg in my general motoring (like you) and on a recent 150 mile round trip I got 30.1 mpg (mostly motorway cruising at 80-85mph)
hope that I've helped
MTC

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Hey there MTC...
Hard to keep track of you these days re the number of forums and threads you are popping up on since 'Arnie: got commissioned!
Regarding your current MPG I presume the reading is from the vehicle's computer readout?
Just a thought...when I had the test drive in the 3.5 petrol model the sales guy told me that the car was recording the MPG in US gallons! I believe the US gallon is 3.7853 litres whereas the Imperial gallon is 4.5461 litres (I think).
If all Euro / UK spec vehicles are similarly configured then surely the MPG will show the US figure? Perhaps this aspect requires clarification from your dealership or DC UK.?
Regards
Geordie