2.0 tdi

Hi Chaps I have a 2.0 Diesel 140BHP LWB 125K old and get around 30 MPG everyone else seems to get loads more?? I have 255/ 40 tyres and 20" wheels but MPG was pants before too. I have since had the bugger Tweeked and DPF removed etc. 175BHP and 395NM but still low MPG just lots ,more rapid and...