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To answer your first question Yes. From what I've gathered when you got the 20" wheeels on the fx4 package you automatically got the 3.55ls. Atleast thats how my 07 came and it has the tow package. The best I've seen to date is 19.1 mpg with a tonneau on my drive from Indiana to Maine and back. Its more like 13 driving around town and 14.5 if I actually get on the interstate for a good clip. And somewhere around 10 maybe 11 (on a good day) if I'm pullin my Javelin 379 FS.
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