Ram towing mileage

I get 16 in my 2012 with no trailer, and 12 with my car hauler empty, slightly less with a car on it. Pulling the camper I get 9, and no matter where I drive, I’m ticking. I spent $8k on a new engine and getting it installed, 10k miles later and the old Hemi tick has come back. I’m about to jump ship and get me a GM truck, these Rams suck!