have a very off smell coming out of my exhaust. It isn't the usual smell of any exhaust it almost smells like rotten eggs. dont know whether it is exhaust system or something else. My car uses a lot of fuel about 17.5L/100km. Any help would be much appertiated.

is it a 4.9v8 or an rb30???? sounds like you gutted your CAT. Vl's had a bad smell when the cat was either removed or gutted. It may also be blocked.