Ok.. confused again about road tax prices. see link:?

Http://www.direct.gov.uk/en/motoring/owningavehicle/howtotaxyourvehicle/dg_10012524so if i buy a 2005 reg band g car what do i pay?it says on the second table that is is £165 for 6 months and £300 for 12 months for cars registered on or after 23/03/06. so what do people whose cars are registered before 2006 pay?
Answer
Band g only applies to cars first registered on or after 23rd march 2006. if a car was registered between 1st march 2001 and 22nd march 2006 inclusive the maximum band is band f - therefore even if the co2 emissions are greater than 225g/km, the tax will still be charged at band f prices.that is why there is no top limit for band f in the table.it also means there is no such thing as a 2005 reg band g car.