Four Winds 22E vs Coachmen Freelander 21QB

We bought the 22E about a year ago. It has been a good coach and Thor has been cooperative to repair a problem we experienced. The fresh water tanked leaked and damaged the booth. Thor authorized a local rv repair center here to repair the leak and replace the booth parts. Ours is on the Ford E350 chassis. Our mpg ranges from 7.5 to 9.6 depending on terrain and winds at 62 mph. I have heard that the Chevy gets a little better. You might want to read about problems with leakage coming from the overhead bunk on Coachman units.

Floorplan Rules! Be very sure you (Self/SO/Family) can accept the layout, then work from there. In that size, I like Chevy. MPG should be a little better than Ford E350. You get better room and handling as well.
Check construction detail in the FRONT of the coach body. By that I mean the Cabover and if it has a Front Cap, all the better. The more cap, the better. I'm not following this in detail, but it seems the Sunseekers have less leakage problems than some of the Coachmen models. Best to NOT have a Front Cabover Window, and many fleets delete it to get rid of a problem spot. I wouldn't disqualify a coach that had it, but would skip it if there was a choice. That said, the Window isn't the only source of Cabover leaks. Plenty of other sources!
The odometer mileages you're seeing in the CW former rentals would not concern me. Mileage and overall wear should figure into a lower price than dealer trade-in units, but maybe not on a private sale.
As you look at rentals, make sure they didn't delete options you just can't do without. A roof ladder and the awning are items commonly left off the rental fleets. They must be a source of headaches for the fleet owner. Work that stuff into a deal if you otherwise like the unit.
Also, very common for many many RVs to not have roof vent covers. They aren't expensive but they're very helpful.

We have a Sunseeker 2300 Chevy. I think it is very similar to the 21QB. We have about 2000 miles on it, just got it. MPG has improved with each tank. The last one, we got 10.0 averaging 65 MPH on I-10 from Las Cruces to Tucson with light headwinds. I was running 70 for a good stretch, even. These are hand calculated, but the computer matches the calcs to within 0.1 MPG.

At 65 in 6th gear, it runs just over 2000 rpm. At 70 it runs about 2200. It doesn't have an instant MPG readout, just a resettable average. Instead of looking at an instant MPG reading, I find that watching the RPMs does the same. If I can keep it in 6th gear, I'm doing good. Having 6 speeds, it doesn't take much to make it downshift to 5th. In 5th, 65 MPH is about 2500-2600 RPM. It's smooth and has very good power. We are not towing, so I can't comment on that.

Our previous MH was a 23' B+ with the same motor and a 5 speed on a 3500 chassis. It was more aerodynamic, and we got 11.5-12.5 at 65 with it. The Chevys do real well for MPG. I do better without cruise control than with it. But I do use it when it's flat.

And they handle good too.

the Coachmen Freelander 21QB looks a lot like the one I wanted to buy a couple of years ago. a huge basement storage area in the rear.
bumpy

The salesman is correct You will get between 9 and 12 mpg. Most likely 9.1 mpg. Maybe 10 on the downhills.

If you really baby it and aren't in the mountains of the west or hills in the northeast you might see 10. If you can't live with averaging 7-9 mpg stick with a B.