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Dude. I'm having a problem with my cts mileage too. I did the same as you and put in stock tires and actual tires into the cts. It says I'm getting 12+/-, with 75% hwy driving, yours says 15-16 city?!!! Damn, I have problems then. BTW I had/have the same strategy and tires are close to same. I think our strategy sucks btw, bc I before I had the tune my mileage was even worse, around 9 combined(hand calc). Now that you've tuned it though, the strategy doesn't matter anymore, supposedly.
I believe you're hand calculations are around 2mpg lower than what you're actually getting, but not totally sure. Your CTS trip meter miles should be correct, but I have huge doubts about that from my situation.
Just curious if this strategy might have something to do with this: Are you getting a code U0306 after loading your tune?
SCT tuner will not correct the speedo btw.
Now where can I get one of those monster CCR stickers? Sign me up! Ok maybe just a little sticker, I got caught up in the moment.
2003 F-350 6.0 Lariat FX4 SC LB
Oil & EGR coolers clogged... Getting estimates now
SCT SF3 w/ Gearhead Tunes
Edge CTS w/ EGT, camera
Cat & Muffler Delete
35x12.5 Toyo MTs on
18" Fuel Octanes