Crase Street (as an example) in Teneriffe to Grey Street, Brisbane is quoted at 4.14km by foot, or 4.33km by car.
Distance checked by:
http://www.whereis.com/whereis/directions.do
As an example of living costs, we can live OK on about $1,300 per fortnight, (after accommodation costs) for a family of three, with 2 cars, and a child in Private school. Other funds are required for main holidays etc.
Different people have different expenditure styles, so it is difficult to answer fo each individual. eg: If you have a wife that loves Shoe Shops, that can make a difference, if you don't ........ (lucky you :D )