Sentra 2001 gas mileage problem

I have a nissan sentra 2001 with 170000km, 1, 8L. It is running 410km with full tank 50L (at station I put exactly 46L when gas indicator just started light, and put odometer on trip, illuminator lights at 410km all is city driving) which is very low MPG. The engine light was on and the scan said it was the O2 sensor which was replaced. Few days after that, the engine light illiminates again but I don't know the code but I assume it isn't o2 sensor since it was change with dealer part. I realize the problem become worst with fuel consumption. Note that tires pressure ok, overdrive off, no weight carried, automatic transmission and vehicle looses power sometimes in the morning or when stopped for longtime. Now it is even worse with 315 km(less than 200 mi) on full tank


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