bouckarooo

^ wicked. works great. Also you can use an o2 simulator.

Kronn 98SH

The rear O2 should have no effect on gas mileage.

__________________
1988 Prelude S - victim of an 80mph backflip
1991 Prelude Si - sold
1989 Accord DX - impounded
1998 Prelude SH - totaled on 3/29/12
2006 CRF150F - sold
2006 YZ250F - sold

bouckarooo

i threw a p0420 when my cat went like three years ago. I ended up using a high flow and it threw the same code until i installed the defouler. The it went away. I dont know if it affected the mileage much but it did help in clearing the code.