We're in a similar position in that we were feeding every 2.5hrs and he's starting to go longer, but it's all a bit messy.
I will often offer an extra feed if I know he won't make it through a nap before he needs to eat again. In the morning he seems to be going ages between feeds but this then translates to every two hours in the latter stages of the night. Atm we're getting 5-6hrs in the first part of the night so I'm ok with it, just don't want to shoot myself in the foot.
Are you offering one side or two? Any top ups in there?
I'm fairly convinced that we need 7-8 feeds per day and that sometimes they need to concertina a bit. With DS1 we did 7,10,1,3,5,7 and then 7,11,3,5,7 if that makes any sense?