It is not unreasonable to comment on data sets that are public and available to us all, regardless of what we each personally drive.
mpgomatic rates the CVT equipped impreza at 36 mpg, CR rates it at 35(haven't actually seen whether this is cvt or 5mt but its the only number i have seen here not having paid to see CR's site...). EPA says 36.
it seems to me those numbers are all kosher. CR's is lower, but 1 mpg isn't something i'd call outrageous deviation... but then i'm not a statistician.
Steve, best of luck with your complaint, you'll need it. I hope you're satisfied with the result, whatever it may be.