If your looking for suspension specifically I think they will bring another Diesel spec lower end FX4 out in the next year or so.
The demo Raptor V6 petrols I have had all hover between 14 - 18 litres per hundred. You can nearly watch the fuel guage go down around town.
What's your average speed?..our former G6ET sat at 14L/100km because driven daily by my wife from home to cbd in real crawl stop/start with an average speed around 22km/hr....a weekend visit to the in-laws saw average speed rise to say 35km/hr and fuel drop to 10L/100km.