ANSWERS: 1
  • There are a couple of sensors in the fuel injection system that could cause this drop in mileage. The first one I usually check or replace is the coolant temperature sensor. This is usually the first to go, and will cause your engine to think it needs extra fuel to combat cold conditions. I would suggest having your s-10's on-board diagnostics checked first. Most auto parts stores will do this for free, and if it shows an error code, this could eliminate a lot of guess work.

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