3rd gear until 40mph, 4th gear then until around 55mph, then maybe 5th as long as I won't be slowing down for a while. 6th gear at 60mph if I am on motorway. Would 5th at 30mph be a little low and potentially not good? Cant really see how on earth you could do 30mph in 5th in a 180..it would stall the car. For me it's normally 3rd gear until 30mph, 4th gear until 40mph, 5th gear until 50 and then 6th - and I won't necessarily change down until I have to. It's generally A roads and motorways in 6th, B roads in 5th and I tend to use 3rd in town (30 limits) to help keep those points at bay. ;)