My RWD SS got high 13s to mid 14s city and low to mid 17s highway with the 4L70E. I did a TR6060 swap in it and when I first started driving it after the swap, I was driving it pretty conservatively getting the clutch broke in and making sure evertything with the swap was good, I managed to get a 16.1 city. I haven't taken it on a lengthy trip yet, but i'm guessing with the .57 6th gear on the highway with cruise set, it will probably get around 19 maybe 20 if i'm lucky.
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2008 RWD 3SS with a TR6060 6 Speed Manual Trans Swap and Level 2 Monster Clutch