DOWNgrading truck - sanity check please

The slight fuel savings isn’t worth the extra cost to acquire a new truck imho unless you have more reasons to want something new. How many thousands of $$ will you have to pay for a different truck to gain a couple of mpg? It would take years to recoup the difference if you could at all. You’ll be losing capacity while down grading to a 1/2 ton while gaining little, if anything, in ride quality. Doesn’t seem worth it to me.