My work van is as above a T Reg Escort 1.8 TD and I used it over the weekend to collect a few bits, drove 435miles all in and it used £80 worth of fuel, thats 28mpg!!

Also it's way down on power, it will do 70mph tops and even the slightest hill will make it slow down to around 55-60mph and this was unladen!
What could make it so slow and thirsty? I was thinking maybe coolant temp sensor is dead and so it's overfuelling?
Any suggestions greatly appreciated!