I flashed Malone dynamic egr. No other tunes/mods. I noticed two things that I had read about and was looking for so it may be confirmation bias, but I guess they make sense: The throttle response is a tiny bit faster in D, and the exhaust smell is a little stronger when idling after it's warmed up. But I'm sure nowhere near what it'd be with a full delete.
A 37 mile test drive circuit (off-road, of course) gave me 49.5 mpg. That is I believe without a regen happening, though, and I think I had a tail wind for part of it. But before the tune I would have expected to see around 40. According to the computer. 42 tops on long trips.
I will take it on a 400-mile test circuit next week, starting and ending at the same pump, and will calculate the mpg. Not expecting 49 mpg, though, but hoping for higher than usual/stock.