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Manual locking hubs will get you better non-4x4 FE and will show a bigger hit when using it. Some systems keep the trans out of OD while 4x4 is engaged under the assumption that if you need all 4 turning, you probably shouldn't be driving 70mph. Some trucks also suffer bad handling characteristics while in 4wd at higher speeds so keepng trans out of OD kinda keeps the driver out of that bad zone.
Keep in mind that with manual locking hubs, it is recommended to periodically lock them to make everything turn and distribute oil to keep bearings and stuff from going dry.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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