How old is your baby? Some breastfed babies don't do well on 4 hour EASY too early. Mine started stretching her feeds to 3 hourly only when she was older and still sometimes wanted to nurse more often than that at 4 months.
It is really an independent thing how well your lo is able to tolerate a more spaced feedings. I know Stacy aka Gracekellymom didn't introduce 4 hourly schedule till her Max was much older, 7 or 8 months, if I remember well. I never tried as in the first book I read, Tracy wasn't talking about it and to be honest, we were OK with every 3 hours.
So it boils down to the fact if your lo would be willing to cooperate more in the evenings and eat more often, I assume he is around 4 months old, so you can still offer him cluster feeds. Do you do dreamfeed?