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First of all, have you checked to see if your ECU has any error codes posted? How low is your low mileage?
The oxygen sensor is screwed into the header pipe between the exhaust manifold and the CAT. (On my car just in front of the CAT.) In 96 a second oxygen sensor is located just after the CAT, but I don't think your car has a second one.
The knock sensors (2) are located under the intake manifold. Approximately at cylinders 2 & 5. I wouldn't mess with them unless your ECU has error codes that indicate a problem with them.
The Air Mass Module is the about 3.5 inch cylinderical part connected between the air filter and the rubber elbow that attaches to the throtle body. Again is there is a problem it should have set an error code in the ECU.
Check to see if the heated air thermostat in the bottom of the air cleaner is operable. It should be allowing fresh, unheated air in if its temperature is above about 70. Its cheap enough to just replace if there is any doubt. If hot air is being fed to the engine all the time it will hurt the mileage as well as kill the AMM eventually.
Around town with a heavy foot I only get about 18MPG. On trips to my parents house with 300 miles of interstate at about 80 I get about 24.
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'96 965 with 16' wheels at 110K. Had '85 745 Turbo Diesel for 200K.
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