The SALR can range from 4°C to as high as 9°C per 1000 m, but the average for JAA exam purposes (for lower levels anyway) is 6°C per 1000 m, or 1.8°C per 1000 feet (it's clearly written in the learning objectives).
And Gordy - if you want to make best use of your performance charts in mountains, lapse rates are very useful.
Phil