check wheel bearings, breaks, break pad wear indicators. I doubt its cv's as thats more of a clunking.
haha, got an weird error posting this, proberally cause it was moved;)
Work out your fuel ecconomy.
Goto a servo and fill your car to the 1st click on the fuel pump
Reset your trip meter
drive about until your down to like 1/4 of a tank
go back to the same servo/pump and refil to the 1st click
look at the bowser and note down the kms
look at how many kms you have done
divide liters by kms then times that result by 100
This will give L/100kms
post that up here.