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Is it a 4 wheel drive truck? Does it have locking hubs? If it has locking hubs, leave them in "unlocked". If you leave them locked in, it's still going to use fuel to spin the differential. Also, removing the front driveshaft doesn't help with fuel economy as the differential is still spinning.
If you do not have locking hubs on your 4x4, remove the inner shaft on one of the sizes so that the differential is not spinning. **** IF YOU HAVE BEARINGS THAT ARE HELD TOGETHER BY THE AXLE NUT ON THE SHAFT, LEAVE IT IN PLACE ******
I second the 215 85R16 tires - less rolling reistance
Also, look for a 5w-40 oil instead of a 15w40. Mobil1 Turbo Diesel Truck or Rotella T6 5w-40 are highly rated. Shell is going to be coming out with a T6 0w-40 ... that will probably help with fuel economy too.
Grille block if you live in a cold climate.
Maybe Electric fan if you don't tow.
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