Driving impression: John Deere 7950i forage harvester In replacing its 690hp 7850 with the 812hp 7950, cynics will say the new Deere forager flagship is just a ‘hike in horses’ job. Not quite. As it turns out, there’s rather more to this new Deere model. For starters, those extra horses are used more ‘intelligently’, as James de Havilland discovers in Somerset