Try nuts for slower paced endurance type rides.Personally I like pitashios (unshelled and lightly salted)on a long ride as they even have more protein and a few more carbs than most nuts.You can combine in a trail mix with dried fruit and dried coconut if you want to add a few more carbs.Apricot is a good fruit to use as its low glycemic and extremely high in potassium an electrolyte important during long rides(a little sodium from the nuts helps to balance the potassium).The unsaturated fats from the nuts and MCT's from the coconut actually help in training you body to use fat as fuel just don't overdo it caloriewise.The unshelled pitashios tend to encourage you to not overeat due to the effort to shell them before eating.