...for an airliner in standard cruise? I know it varies from type to type, but I'd just like to have an overview of what's right and what is not.Cheers,

Above 0 and below Max. ;-)Seriously, it is going to vary a lot depending on aircraft type, engine type, alititude, speed, etc.As an example, using 767PIC it shows to be around 92-6% when at 0.80M and FL330. Some feel that is too high, but the Boeing manual for the GE engines disputes that.

And in the Citation five 104% N1 ;-)Peter