Tyres for Landrover Discovery 4

The Pirrelli Scorpion ATR tyres fitted to my Discovery 4 need replacing and have been excellent but are no longer available. As I do use the vehicle off road I am reluctant to fit the the road version Pirrelli Scorpion Zeros. Research suggests General Grabber AT are said to be good both on and off road. They have a less aggressive tread pattern than the AT2 version. Has anyone used the AT version. Is road noise and mpg a problem?