In warmer weather 20c/70 f and up we use the 5th bar setting. keeps fridge at the 38-40 f Range freezer keeps stuff frozen but has trouble freezing something as the outside temps get into the higher 20's or closer to 90f. We use propane or 120v. I don't bother with the 12v setting. I know there are those that don't aprove of travelling with the propane running, but we do it.
I have acutally never had a rv fridge that i had to run @ full power to get sufficient cooling before.
2016 GMC Yukon SLT