This is pure curiosity, not for immediate use.
I’ve seen various sources that claim that modern home house-current refrigerators - including the mini-fridges and dorm fridges that might better fit a sub-RV size vehicle - are typically about an order of magnitude (sometimes more, sometimes less) more efficient electrically (in kWH / day) than 12V RV refrigerators.
But that sounds completely nonsensical. If it were true - why wouldn’t RVers just use an inverter?
Obviously, for non-electric-campground use, the outback dual or tri-power ones, that can run on propane make sense. But for the rest?
And is the efficiency difference true of the small minority of 12V fridges that use compressors instead of something else?