Average readings are frankly just a guide. They don't tell you an awful lot.
You need to test on waking, then at least 2 hrs after a meal. Some people test 1 hr after a meal as well and before going to bed. Depends on your readings throughout the day. Only in this way will you know if you are doing well or not.
As a T2 your Feb 2009 guideline Bg readings are as follows:
Fasting (waking)..................between 4 - 7 mmol/l.
2 hrs after a meal.................no more than 8.5 mmol/l.
Ken.