$269.69?!?!?! That *%@#@&* much for a little sensor with four little wires attached to it? Does one really benefit that much from a new sensor? With my aftermarket intake and exhaust, I'd expect the car to run more efficiently, but I've only been getting mid-20's in MPG, in city/hwy mixed driving (maybe I am revving it too much) Afterall, $270 buys a lot of gas...