Agency is buying vehicles that get just 8.6mpg
                                
                                
                                    (Newser) -
                                    The Postal Service disappointed a lot of people when it announced in February that only 10% of the roughly 150,000 delivery trucks it will buy in the next decade  will be electric . Now, some of them are suing to block the purchases of gasoline vehicles, including 16 states, DC,...