So I just picked up my a4 avant TDI 170bhp. The car was my brother in laws and has sat unused for 9 months and was serviced 2 months before it was put off the road.

To me 6th gear feels very sluggish, I had the 140bhp Leon before and in 6th it would accelerate up a hill no problem but I had to drop the Audi to 5th to accelerate. It pulls well in the gears so just want to see if that's how the car is or if it's something I need to look at more

Nah bro I had a mk4 golf 150bhp n was slow in 5th gear only used it to cruise, my current car 220bhp again 6th gear I cruise 6th it is generally known as the motorway gear. There's nothing wrong with your car mate. I reasearched this myself years ago :) 

I agree with Riccardo...it is just a cruising gear, not an accelerating gear as such

Excellent guys cheers. Still getting used to it lol

 

No prob