A:AnswerThe yield on the standard 923 cartridges is 500 and the yield on XL cartridges is 1000 at best. Meaning, if your prints have a lot of text or color, they will not print you as much as it is stated.
A:AnswerThey are very similar models. The main difference is that 8135e has a USB port on the side for flash drives and you have faxing capabilities. Same tray capacity, same print speed, same cartridges and both can print 2 sides.