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1999 Saturn SL2 Bad Gas Mileage 12 miles per gallon

Tiny
MGG4591
  • MEMBER
  • 1999 SATURN SL2
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 84,450 MILES
My car is getting 12 mpg both highway and city average. I don't hot rod it, and I warm it up in the winter before I bring it out. This mileage is consistent for both the winter and summer. I calculate my mileage by miles driven/gallons used.

I have no clue what is wrong. I brought it to the GM dealer and they said the car runs perfect.

Here is a list of everything I replaced:

Battery
Air Filter
EGR Valve
PCV Valve
NGK Plugs and Wires
Control Module
Starter
WIX #33731 Fuel Filter/Regulator
ECTS and Connector
AIT Sensor and Connector
MAP Sensor
Front Manifold Oxygen Sensor, OEM
Thermostat
Valve Cover Gasket
Cleaned the Throttle Body
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Wednesday, February 3rd, 2010 AT 12:59 AM

2 Replies

Tiny
TAYLORDOEGE
  • MEMBER
  • 1 POST
I noticed your list and one thing that comes to mind would be your coolant temp sensor. Its an 8 dollar part and is easy to replace. It is located on the driver side part of the engine, just in arms reach on the side of the engine block.
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Tuesday, February 9th, 2010 AT 10:33 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
I'll second that on the ECT...very common on those.

https://www.2carpros.com/forum/gas-mileage-tips-vt135422.html
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Thursday, February 11th, 2010 AT 1:38 PM

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