Well only since you agreed as a good sport.

Really the only folks that can answer that are your neighbors in the same building. Even then, some units may have issues; I new someone in a new building that had $500+ heating bills the first winter the building was open, and after the developer looked into it to make sure the unit was wired correctly found they didn't seal the concrete slab for that specific apartment correctly so all the heat was getting wicked away. Which side of the building your on can also make a surprising difference in heating/cooling costs depending on the sun.

Did you have PTACs in newport? Most friends I know with PTACs in new construction run $100-250+ during cold months heating the place, more if it's actually cold VS the last few months. Keeping them low & on all the time so it runs the heat pump (if it has that) helps.