I've been meaning to post this question since returning from the Green Industry Expo. I asked eXmark, Grasshopper, Gravely, ect about their diesel powered 60" class mower's fuel consumption and all of them told me "one gallon per hour under normal operating conditions." This is reguarding the 27hp Briggs diesels and the 21 & 22hp Kubota diesels. Since when did these small diesel engines start consuming so much fuel? Are they mistaken? Playing it safe? Or do I have a bad memory? I don't recall my 3 cyl diesel tractor ever using that much fuel back when I had it. Best I remember I had a 5 gallon transport can to use when needed and that was plenty to run all day on.