Right, my mother in law has a Astra G 2.2 coupe with a full exhaust system and a modded air filter and I have a Astra G 1.6 16v SXI.
She seems to be getting more miles out of her tank than I do out of mine. I don't drive like a **** and I doubt she does either.
Only thing i can think is that the tanks are different, am i right?
Everything I do has total support of my wife ...... which is nice!
I thought all Astra tanks were about 50L could be wrong though, does she put more fuel in would be the simple answer... Alternatively check out the handbook, it has all the capacities in there.
N.b. any opinitons expressed above should be ignored and considered 'ramblings', under no circumstances should they be relied upon...