I managed a princely 37.3mpg there on the last tank - thats 373miles on 44 litres of fuel.
I use Gas cubby on my phone to keep track of fuel and servicing costs. The last few mpg figures are:
37.3, 35.6, 34.1, 36.3, 33.7 mpg!
Have to say, Im quite impressed with the astra. Ive changed fuel...