Welcome to the site!
To start I definitely think 11 mpg is possible. My FLD120 conversion with Cummins M11 and 10 speed weighted in at 30,000 lbs plus and averaged 11.5 mpg. Although when I put in a new Super 10 transmission it dropped. Not sure if it just need a bunch of miles on it before it came back.
Obviously the most important part of the project will be the truck. Do your homework, take your time, there are incredible deals to be had on used trucks and I guarantee you are going to be able to pick up a great working truck starting at $10,000 on up. The great thing about big rigs is that is is very easy to change out anything on them at pretty reasonable prices.
Definitely do some searching on this site. I detailed my first conversion which included the purchase of my truck along with the work I did to it.
Alot of valuable info.
Good luck on your project and keep us posted
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2012 Showhauler 28'6" Motorhome on a Columbia w/ 450 Mercedes.
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