Proghound
Admin Team
As a rule of thumb in a TDI75 on a long motorway run you should reckon on MPG = 130 - speed. (Probably holds better at lower speeds than higher ones, since wind resistance increases with the square of speed). So 70-75mph should give 55mpg or thereabouts, so you're not too far off. The temperature and the wind speed and direction will also have an effect. I once got 72mpg out of my Crystal one over 200 miles at 60 on the cruise control, with 3 people and luggage for a week's self-catering. But the yellow Storm only ever seemed do mid-60s on that sort of running.Most I could get on motorway driving was 54mpg at 70-75 with my tdi, two people and a bit of luggage
A TDI90 is known to be thirstier. Several owners report averages in the 50s rather than the 60s. It would be interesting if a '90 owner could do a really long run - say from the South or South West up to Scotland at 60mph and report back what they get.