I am wondering what other people get out of their 170 diesel. I do mainly short trips which I know wont help but I am getting around 400 miles to a full tank which seems low to me

its difficult to compare as we have different cars, mine is a 140 common rail remapped to 180. i get around 500 with a mix of driving which works out to an average of 35mpg which isnt bad considering my right foot is constantly planted to the floor. my trip counter + remaining is currently saying i'll get 650 which would be 46mpg, however i've done a 140m round trip on the motorway (85+) and back with no local driving since i last filled.

oh, and i use biodiesel which is said to reduce MPG by around 10%

Either way, 400 sounds low, if your tank is the same size as mine? 65l. that'd be an average of around 28mpg!

Yeah i thought it sounded low. The range just keeps on dropping without me doing many miles. when i first filled it said over 600 I have now done about 90 miles and its down to 430 miles.

Had a quick look online there and seems the 170 is very bad for fuel