No, because of the manner in which they’re used. In addition to their large weight and non-aerodynamic boxy design (not to mention resistance from open doors), mail trucks make frequent stops and drive at very low speeds between mailboxes. And they often idle while doing so. USPS says that it spent $2.35 billion on energy in 2007—75 percent of which was for transportation. The same source says that fuel for cars and trucks accounted for about two-thirds of all transportation fuel spending. That said, the Postal Service also operates the nation‘s largest alternative fuel-capable fleet, including more than 36,000 E85 flex-fuel vehicles that can operate on gasoline, E85, or any mixture of the two fuels.
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