no... at least that's not how I read it...
"The Bargersville police department still operates six combustion-powered vehicles in its fleet, which consume $2,900 in gas every month. In comparison, the 13 Teslas that the police department operates cost about $600 per month to charge. “It’s working, it saves a lot of money,” Bertram noted."
the way I read that is
6 ICE cruisers use $2900/mo total for gas
13 Tesla cruisers use $600/mo total for electricity.
for their taxpayers sake, I certainly hope they're not spending almost $3k each month for fuel in EACH ICE cruiser... that would be $208,800/yr just for gasoline for 6 cars... but taking your read of it, the electricty cost would be $93,600 still under half what they spend on gas for twice as many vehicles.