Looks like you have the same gear's in the rear that mine has, but you have the shorter later model metric sized tires. Should still get some better milage than mine though with the 5 speed auto. Unfortunately for me 01-02 can be updated to the extra overdrive, but 00 is an oddball and cannot be upgraded to the extra OD. Just make sure to push the OD off button before towing and have at it. And if you don't mind ahving her growl at you when you get on it, put a MAGNAFLOW muffler on it with the stock pipes. It made a HUGE difference in mine, you'd be surprised at how restrictive the stock muffler really is.

Stock 4.7L with just a MAGNAFLOW muffler.
http://www.youtube.com/watch?v=WTbQt...e=channel_page

And if you want to go extreme.
http://www.youtube.com/watch?v=qLY3M...eature=related