1. Start the engine. Set the heater temperature control dial to maximum heat, or climate control system to HI, then turn off the ignition switch. Make sure the engine and radiator are cool to the touch.
2. Remove the radiator cap.
3. Loosen the radiator drain plug, and drain the coolant.
4. After the coolant has drained, tighten the radiator drain plug.
5. Remove, drain and reinstall the reserve tank.
6. Fill the reserve tank to the MAX mark (A) with Honda Antifreeze/Coolant Type 2 (P/N OL999-9001).
6. Pour Honda Antifreeze/Coolant Type 2 into the radiator up to the base of the filler neck.
NOTE: Always use Honda Antifreeze/Coolant Type 2 (P/N OL999-9001). Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail.
Honda Antifreeze/Coolant Type 2 is a mixture of 50% antifreeze and 50% water. Do not add water.
Engine Coolant Capacities (including the reserve tank capacity of 0.6 L (0.16 US gal))
After Coolant Change: ? M/T: 5.1 L (1.35 US gal)
? A/T: 5.0 L (1.32 US gal)
After Engine Overhaul: ? M/T: 7.2 L (1.90 US gal)
? A/T: 7.1 L (1.88 US gal)
8. Install the radiator cap loosely.
9. Start the engine, and let it run until it warms up (the radiator fan comes on at least twice).
10. Turn off the engine. Check the level in the radiator and add Honda Antifreeze/Coolant Type 2 if needed.
11. Put the radiator cap on tightly, then run the engine again and check for leaks.
For question 2, if it is fuel that you are referring to, it depends very much on driving technics.
For question 3, this is a maintenance free component and there is nothing that you need to do.