We did the same thing last year after 9 years of motorhoming. We've spent about 4 months in the Winslow and put about 8k miles on it since we got it a year ago last June. The cost of travel is a little better as I get 11.4 mpg compared to the 8 I got with our diesel pusher. Our truck gets about 17 mpg around town and 21-23 on the road which compares favorably to the mileage with the Acadia we towed. Of course, diesel is a little higher than gas.
The big difference is the cost of maintenance and repair. We just did a 4500 mile, 6 week trip and all I had to do when we got home was wash the truck and the Winslow. Never happened with the motorhome. Always something and never cheap. The wife misses the convenience of going down the road and the freedom she had in the motorhome but once we get there we have found the Winslow to be much more comfortable for living. With auto leveling set up is a breeze.
On edit: Snowman, saw your comment after I had posted this. We had a diesel pusher for 7 years and they are a fun way to travel. We had a pretty good one but still had some issues as there are a lot of moving parts. Part of our problem was no one in our area would work on it and I either had to just do it myself or spend the time and effort to drive 150 miles to get it serviced or repaired. The cost of servicing the drivetrain are exponentially higher just due to the size of the engine and transmission. We replaced the tires and the cost of 6 22.5" tires is pretty stout. Only you can decide what is best for you so my comments may have no meaning for anyone else. For us, it was just a matter of peace of mind not having to deal with it and worry about what would happen if something major like an engine or transmission blew. I know something could happen with our truck but I tend to trade before the 5 year drivetrain warranty expires.