I think now is a great time to start replacing them. Hybrid technology has more than proven itself. PHEVs are well on their way to proving themselves as well. The vehicle's use makes a HEV or PHEV or even EV quite ideal.
The cost to keep the current fleet running are insane. According to
wikipedia...
Quote:
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In fiscal year 2009, the USPS spent $524 million to repair its fleet of Grumman LLVs...
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That is a lot of dough.