Originally Posted by Nasty
You can input the gravity you're looking for and the mfg date. It will tell you how big a starter you need to reproduce them to a good count.
I plug my information into Mr Malty along with the date on the pack and it tells me that I need 7 packs of yeast with a 2.8 liter starter.
If the pack were a month old, I'd only need one pack and a 2.5 liter starter.
Getting back to the OP, sure it can be done with one pack and stepping up the stater, but as a customer should I be expected to do this? Do you think that there is an age of the yeast where the vendor should either discount the product or at the very least, bring it to your attention that there will be extra work involved?