Tractor test: Fendt 820 Vario TMS A tractor’s propensity for fuel has become a hot topic over the past 12 months. And with red diesel currently running up at the 50p/litre mark, when not so many years ago it was priced down at 20p, this keen interest in tractor guzzle rates is entirely understandable. On top of that, of course, there is the constant industry talk of relentlessly tightening emissions regulations doing their bit to increase an engine’s craving for the pink stuff. We test the 140kW/190hp (ECE R24) Fendt 820 Vario TMS