Test an O2 sensor
How do you test an O2 sensor to make sure it's functioning properly? I'm getting about 11mpg and I'm going through everything that could be causing this bad of mileage to try and eliminate it. I've already done cap, rotor, plugs, wires, fuel filter and air filter. I'm going to pull off my throttle body and clean that out as well as all the sensors.
Any other suggestions on improving my mpg will be greatly appreciated! I'm not expecting 20+ but I would like to get back to around 14 or so.
Also I do have a small exhaust leak in the manifold and I have a replacement on the way.