for some reason i feel like my car can only hold 40 litres of petrol rather than 50(usual) because when i filled up last time when the needle was near Empty it only cost me 50 bucks and 32 litres (approximate). Not only that my 1994 dc4 only does around 300km per tank so could there be something wrong with the O2sensor? or is my car only holding 40 litres or am i just tripping out?