I have been running my Gravely 400 series going on two seasons now. IMO it has the best combination of comfort, cut, and quality in the industry. It is the machine that has set the bar. Mine is not diesel but I have run Kubota diesels with over 5000 hours which averaged 1 GPH.
I have a huge review on my 452 if you want more detailed info on the 400 series.
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