Perhaps try using gasoline that has 0% ethanol content? Hard to come by these days, at least around my city - only one Conoco station has it,
afaik, but it's worth it for various other reasons as well... who the hell decided it's ok to "cheapen" gas w/ alcohol? Yeah, the octane rating is the "same," but pure gasoline is superior to blend.....and it may help prevent the hot start problem - I used to have the issue, but haven't really noticed other than one or two occasions over the last few years ('05 S owned since '05) ..... does suck when it happens.