OK, I need to get the real skinny on the 08 models. I believe an "AS" with 28HP/60" would do me fine, but am leaning toward the "Z" to get the 28HP Kohler with EFI/60". Is the EFI as good as as the brochure says for fuel economy? I'd really hate to go EFI and end up pi$$in in the wind! Also is the suspension seat really all it's cracked up to be? If we're talking mere assumptions, I'll probably go the AS route, but am willing to go with the Z if EFI and suspension seat are the real deal! thanx.