Over the last few fill ups: 21.0; 20.0; 22.3; 21.6; 19.3; 20.9; 20.4.
Includes a lot of driving around the mountains in Arizona (between 4k-9k ft) and then driving back to DFW. No real babying. 75 on the highway including a fierce headwind on the 20.0 tank.
Installation took me 15 minutes max. And if I knew what I was doing, I probably could have had it done in 5. Harness is already there. Hardest part was just being comfortable with pulling the old panel out.