Look at the map to see how far behind the others are. If they are close, use rear view button to look behind. when in battle I usually look behind 2-3 times on every straight, especially right before braking to see if they are attacking so I know if I can turn in or not. It sometimes looks funny because I think they will attack on the inside so I leave room, but when I look back I see them still behind me
Oh, and I use a DFGT.
I have a T300RS 599XX alcantara with T3PA, on a GT Omega RS9 rig, but I dont use that for GT6, because when I tried it it felt much better but the times was slower. Concidering GT6 is on its last breath, I cant be bothered to learn a new weel for it.
@Stephen Vann : I looked up the wheelstand pro thing, I cant believe you can actually drive on that thing, thats the most wobbly thing I've ever seen!
The wheel must be moving all over the place!