The fleet cost will depend on a number of factors that include the number of taxis and the value of the taxis in the fleet. In addition, the history of the taxi fleet drivers will also play an import role. If you can then provide safe, secure parking for the taxi fleet, this will reduce the overall cost further. Another factor that you have little control over is the fleet postcode. Some postcodes have a higher criminal rate and this will be factoring into the cost calculation.