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Just for reference, the best economy I have gotten out of the truck (2005 Toyota Tundra Access Cab 4x4) is about 22 mpg (highway @ 60 mph). It used to average about 18-20 mpg highway/freeway. Then after the installation of a home-made deer-resistant front bumper and larger than stock meaty all-terrain tires (285 75r16), the economy dropped to about 15-16 mpg highway/freeway. I have since dropped to a smaller (265 75r16) and much more highway oriented tire, so I bet that will give me a little bump, but I haven't driven enough miles to know the effect. My hope is to end up back around 20 mpg with the aeroshell mod and new tires. The desired gains are not extreme by any means, but will definitely be beneficial.
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