LTFT trending rich

Got a 2025 with 20k mi. Over the past few weeks, my off idle long term fuel trims have been showing inching towards +10%. Also have a gas vapor smell occasionally coming in through the vents. No misfires, no coolant usage, no drivability issues. I’m very familiar with working on cars, but this engine is a bit of a different beast. Currently have some Techron in the tank, but it hasn’t improved anything over the 1/4 tank I’ve burned so far. What’s the usual troubleshooting steps and things to check?