MPG?

I recently bought a 2025 Silverado 2500HD LTZ. What sort of MPG should I be expecting? It only has about 2500 miles on it now so it is still breaking in, I’m sure.

Since I bought it at 24 miles the MPG has been pretty consistent - ~10 mpg city and ~ 16 highway. I think my current “best” in the onboard mpg calculator is 23, but I do not see any where near that on average. When towing my 32 foot/~7500-8000 pound trailer I get about 10-12.

I feel like this is a bit low, even with the larger 3/4 ton pickup. It’s a Z71 4x4