I have the 2.4 engine albeit in a 159 2009 ti model with 48,000 miles on it now . I've clocked up approx'ly 1400 miles since buying it when it showed 34 mpg on the dash readout. Since then it's had a mixture of running around locally 2 to 10 miles trips , a holiday doing 250 miles cruising but with a '' fed '' throttle not rammed to the floor when wanting to move on , the rest and the most mileage has been 50 to 90 mph cruising on 80 mile trips over dual carraigeways and M25 travel , including crawling in stop go traffic for 35 miles. Almost forgot a 100 mile trip towing my minno trailer plus 600kg car .
The previous driver must have been short trips or shuving it really hard because I'm averaging 39.5mpg over 3 brim to brim fills even though showing 31mpg while actually towing ----- the dash readout by the way showed an under figure of 2mpg compared to brim to brim.
In January I intend having it remapped / DPF/EGR sorted at ANGEL TUNING Banbury which will probably improve that figure by 10% and cost £330