Well I fixed that problem I was having with the MAP and TPS sensor by replacing both of them, and my gas mileage was pretty good. I was getting about 25 mpg on the highway. Well that lasted for a little bit, but I'm getting bad gas mileage again. Not as bad this time, but still anything that hurts a little bit of gas mileage hurts a lot in the wallet. So how much gas mileage would I be losing from the right oxygen sensor being bad on my car?