Rich - I think GT TDI 170 mapped to 185.
Bian044
Are you running 18" wheels, whats the service history like, when you say not in a rush what sort of distance you you driving and the average speed.
For instance. My GT 170 with standard 17" Classix wheels, based on a daily commute of 90 miles 20 of which are on A roads the rest traveling 70mph on a motorway i achieve 46-47MPG - 500miles to a tank.