Gravely Pro turn 100 series (52in deck with 23HP Kohler EFI)

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I think I'm going to pull the trigger on a gravely pro turn 100 series with a 52in deck and 23hp Kohler EFI. I wanted a diesel at first but can't justify spending $11,000 or more on one when I can get as good fuel savings with the Kohler EFI.

I can get this mower for around $7500 out the door and can get the Pro turn 52in with 29HP Kohler EFI for $8500. The only difference is 6HP and the 100 series has a ZT3400 transaxle setup and the 200 series has the ZT5400 set up.

Which would you go for? and is the Kohler EFI's actually worth it? I know they are better on fuel than a carb set up and have heard really good things about them.