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Ways to increase efficiency:
Cheap
increase gear (change 3.73 to 3.42) or get taller tires
highway type tires vs off road, narrower is better (tires with higher inflation rates have lower rolling resistance, usually)
free-flowing air filter, exhaust
remove any extra weight
lower the truck
add front air dam
plug any holes in front end
get smaller, more aero mirrors
get under-drive pulleys for engine
tune up motor
get a truck cap or tonneau cover
upgrade to HID headlights and LED bulbs
Let vehicles warm up before driving and/or use block heater
More expensive
swap motor for a duramax w/the 6-speed allison trans and put in a 2.42 or 2.72 gear (should easily get 28mpg at 75mph and will run on bio)
reduce frontal area- narrow tires, small mirrors
reduce weight-swap spare tire for plugs and fix-a-flat, unused trailer hitch
increase gear-taller tires, change ring and pinion
driving style-use cruise control, drive speed limit or slower, try to maintain momentum, don't idle more than 45 seconds, combine errands and plan ahead (no left turns)
extras- turn off headlights in daylight, turn off any extra electronics, don't use A/C
Headlights can reduce your mileage by up to 5%
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