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When winter starts...lock your hubs and just shift in and out of 4wd as needed.
When winter is over, unlock.
You won't notice a huge decrease in gas mileage, since you are letting the truck sit and warm up first before driving anyway.
Don't use the auto hubs...they are garbage.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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