(1) - Examples of salary percentage spend on car ownership.

UK -

Maestro Press Release Nov 05, THE REAL UK NATIONAL AVERAGE SALARY,
www.maestrocard.com/uk/news/press_releases1.html. - UK, Accessed Mar 08.

“Official estimates put the average national salary at £22,248”

In the UK the average car costs between £4500/5700 stg per year  - see AA Running cost basic guide for 2007
http://www.theaa.com/allaboutcars/advice/advice_rcosts_petrol_table.jsp

Ireland -   

Irish Times , Car costs up 7% this year, Patrick Logue, Wednesday, July 4, 2007,
http://www.ireland.com/newspaper/motors/2007/0704/1183410227647

“A small family car on the road when fixed and running costs are calculated. Based on an average 16,000km per annum this works out as €11,710.”Average industrial wage in Ireland €30,000 EU