2ltr gx

[mark65]

hi i have a imprezza 2ltr gx and it seems real slow as if my car is dragging like its been dragged back and im wondering if the 4 wheel drive isnt working and its in 2 wheel drive hence the car dragging and wen stopping it stops dead like brakes stuck on but there not stuck on and  also does roughly 200 miles to a full tank which also seems like its struggling can anyone !Removed! to a conclusion for me as i avnt got a clue wot it cud be. thanks mark 078107121001