After several manual TD5's, Disco's and 90's, I think you would get about 27mpg. My manual Disco models did 31mpg driven normally, the auto takes another 15bhp out of the engine (and it IS noticeable, I've driven one) and consequently they are a bit thirstier. Maybe less in heavy traffic, but I live nearly as far as possible from the M25 (thank God..). And if anyone has one for sale, I'm currently looking.. Send PM..