I have noticed the hay is not lasting as long, as the days get shorter the rabbitts prepare for winter and are eating more for some extra weight. I don't add extra pellets but I do try to fill hayfeeder as much as I can. As the foraging has gotton slim I do give my rabbits some types of lettuce (no head lettuce) and a few vegtable scraps. When the teps drop I will add a few black oil sunflower seeds to the pellets. But most of my feeding is generally the same. I do throw in a few pine branches for variety.
I hope you have a good winter and your rabbits stay safe and warm!