For my X595 (diesel) I can run at WOT for one hour and use ~ .7gal.
I have only one complaint about the X595. That darn fuel level indicator is either 3/4 to full or about to run empty. There seems to be no middle (1/2 1/4 etc.)! /forums/images/graemlins/frown.gif
The X495 (Diesel) is the way to go. I replaced my 318 with it and I am very happy! I belive this mower will out last a couple mower decks and me.
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Guess I'm one of the few that isn't worried about the amount of fuel consumed by my X585. I have a 120' driveway to plow and 1.5 acres to mow. Before you tell me that I could have bought a smaller unit, please understand that I feel Tim Taylor is conservative.
My LX280 gas mower seems to be thirsty when compared to the things I've done with the bigger and heavier 4100 which is a diesel. Sure makes me think I should have gone with a diesel mower /forums/images/graemlins/smile.gif
I had a GX335 with the 20-hp Kawasaki before I got the X, and I was amazed (and alarmed /forums/images/graemlins/shocked.gif) at the amount of fuel it took. Now I can fill up with diesel and mow my 5 acres, then do odd-jobs (hauling with trailer, harrowing) for a week or so before I need to refill.