have a tdi a4 and have been told that should get around 50 mpg out of it but only seem to get low 30 mpg from it feels a bit sluggish and had it fault read and changed map sensor as it had a fault any ideas

I had the 115bhp 1.9 TDi manual A4 and was getting 38mpg until I chipped it then 46mpg

pretty common problem