Since getting my Sport XS I've not let it sit over a month or so between uses. But my 225 ProMax SS usta sit 6 months at a time during hunting season and all I ever did with it was make sure the tank had fresh 93 super unleaded and synthetic oil. (That was before the rash of ethanol tho!)
With the Sport XS I run 1 oz of Marine Stabil (blue for ethanol) to 5gals of gas, Merc Prem Plus and 2ce a year I run a bottle of Mercs Quick Clean in it as well. 2 years old, 80 sumpin hours and I'm still on the same plugs she had in her when new. Haven't had an injector issue either (knock on wood) and that's including 87 octane ethanol crapgas.
I also have a 2005 Brude 150 Direct Injection (2nd generation Ficht if you will) on my deckboat and it DOES sit 4-6 months on end. It runs on 87 as well and I began running the Marine Stabil in it as well lastyear. Within the next week or two I'll go fill the tank with 93 octane, Stabil, Quick Kleen and then I'll make a couple mile run down the river and then she'll sit til next spring. Had this DFI since March 2006 and she's still on original plugs and runs like a top! I store this boat an hour from home so I can't crank it during the off season.
I agree tho prolly a good idea to cranker 1ce a month more for the pumps and injectors than anything else. :beer:
RA