1993 Toyota 4Runner, V6, 4x4

moparker said
Did you add the lock out hubs?

Yes. Warn Hub Kit. It actually did improve the fuel milage slightly. On a trip from Portland Oregon to Cheyenne Wyoming I managed a best of 21 mpg.

On my normal commute, before the Hub change I was seeing 17 mpg, now on the same drive I typically see 18-19 mpg.