Holden Trax Engine Problems
Holden Trax 2015: What fuel is best?
If it’s a 1.4-litre turbo you should be using 95-octane PULP, if it’s a 1.8-litre you can use 91-octane unleaded.
Holden Trax 2014: Poor fuel consumption
The claimed fuel economy figure is a result of a standard test that all carmakers have to conduct. It's intended to give buyers a guide they can use to compare cars when choosing which to buy. The figure will differ in real world due to all the factors that can influence fuel economy in everyday driving. I would persist with it, you could find it will come down with more miles on it, and you could look at your driving habits and see if you can make any changes that might cut the fuel useage.