My Bora with the 1.9TDi 90 bhp averages well into the 60's, the curent average mpg since I have owned it is 66.6MPG (devilishly frightening!)
Get the cambelt done asap - a genuine kit inc cambelt, tensioner etc & water pump is £144 (+£45 surcharge for the water pump, which you get refunded); then labour on top unless you can do it yourself. Gives you an excuse to totally flush the cooling system too....
