Adeebbouk

Hi all I have a 2009 1.8tdci titanium focus with 70000 on the clock since I bought the car it's been very sluggish at set off feels live your trying to set off in 3rd unless u really rev the car although it drives fine once your moving. I thought this was just how they were until I drove my gfs mums 55plate 1.8tdci focus with over 100000 on the clock and that pulls from low down and is achieving 50-55mpg where mine is only doin 35mpg any help on this issue would be greatly appreciated thanks Adrian