I have a 09 ultra fully stock, yes 6th gear does feel like I`m lugging engine when 2 up touring unless I`m over 2600 rpm, that said I bought the bike for comfort and the long haul not racing , that said I have also hit the rev limiter many times in the lower gears & I do drive it hard when the wife is not with me . bike just seems to run better if it`s opened up from time to time.