2008 SX25 fuel and fresh water tanks upgrade
 

Hi everyone,

I am planning to increase the capacity of both my fuel and fresh water tanks on my 2008 SX25.

Fuel tank from 57 gallons / 216 liters to approximately 105 gallons / 400 liters
Water tank from 12 gallons / 45 liters to approximately 24 gallons / 90 liters

Has anyone done such an upgrade?
What is better? Add additional tanks or replace the existing?