We have a Lexmark all in one jobby, scanner, copier, colour printer - seems to me the colour cartridge lasts half as long as the black one, but we don't print out much coloured stuff... and the blue always runs out before any other colour. Consequently, I'm spending £20 on a colour cartridge that still has a large amount of use in it, if I print in red.

I'm convinced that this 'use only *****'s cartridges or you lose your warranty' is against some trading standard, it's just pinning it down.

LTS