To get your HP toner cartridge to last longer you can adjust your printer resolution as follows



In printers and faxes right click the for example HP LaserJet printer icon and select "Printing Preferences"

In the Paper/Quality tab you will find “Print Quality” set to a default “FastRes 1200” that you can change to 600 dpi.





You can also select [EconoMode], but you may find it too light, next click the [Apply] button and then the [Ok] button