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This is a very wide encompassing question. It basically revolves around a thorough engine diagnostics and tune up, replacing filters and plugs etc. The quality of all oils will have a small influence on fuel consumption, as will type of tyres and tyre pressures. The most profound influence on fuel consumption is however your driving style and that is a subject too vast to go into here. It boils down to a smooth driving style, judicious use of the transmission (manual or automatic) and driving within the engine torque range whenever possible. Finally high speed requires additional fuel to deliver the power it needs to overcome wind and rolling resistances.
the linkage or the cable from the shifter to the trans.?
block the tires so the car can not roll away...
open the hood and remove the cable from the shifter on the transmission.
see if you can manualy move the shifter on the trans.
if that moves... you may need to replace the cable (shift linkage)
This happened to me on my toyota tercel, and I found that the distibutor cap's seal was split, and the cap itself had a small crack in it. I fixed the problem for less than $20 by getting a new cap from advance auto parts.