The gas price going up higher than ever these days and my 98 Taurus has never been acting gayer than recent days.

Starting last december, I couldn't go more than 190 miles with a full tank driving local area.

I'm not sure if it has anything to do with the gas mileage but when the Gas Light comes on I usually drive 20 miles more before I refuel, and the weird thing is it only takes 14 gallons of fuel instead of entire 16 gallons.

The engine light is off so I'm not really sure what the real issue is, but my best assumption is that it has something to do with one of the O2 sensors.

The problem is I believe there are more than one O2 sensors and I don't know which one to replace and I'm not even sure if it's going to fix the problem.

Anyone has suggestion?

 

measure the actual MPG?