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I solved this one! Replacing an upstream Oxygen (O2) Sensor restored my fuel economy. 3.0L 2007 SEL AWD, so far replaced front upstream sensor. Nothing appeared wrong with any sensors (no codes) but yet my fuel economy went from 9 mpg city and 18 highway back to factory normal (about 18 city, upper 20s highway). I am waiting on another sensor from the dealer to replace the rear upstream sensor. I have searched the forums and google for this fuel economy problem for the last two+ years and every 'expert' almost unanimously says not to replace the O2 (Oxygen) sensors unless there is a code. I finally decided to buck the opinions to replace them and it worked. Background: Car when new had excellent fuel economy, but around 50,000 (K) miles fuel economy went down, and became worse over time. Strangely enough, using cruise control restored most of economy (about 10mpg+) even when comparative pedal input was steady on flat road. The car now has over 80,000 miles with new O2 Sensor and fuel economy restored to new.

I solved this one! Replacing an upstream Oxygen (O2) Sensor restored my fuel economy. 3.0L 2007 SEL AWD, so far replaced front upstream sensor. Nothing appeared wrong with any sensors (no codes) but yet my fuel economy went from 9 mpg city and 18 highway back to factory normal (about 18 city, upper 20s highway). I am waiting on another sensor from the dealer to replace the rear upstream sensor. I have searched the forums and google for this fuel economy problem for the last two+ years and every 'expert' almost unanimously says not to replace the O2 (Oxygen) sensors unless there is a code. I finally decided to buck the opinions to replace them and it worked. Background: Car when new had excellent fuel economy, but around 50,000 (K) miles fuel economy went down, and became worse over time. Strangely enough, using cruise control restored most of economy (about 10mpg+) even when comparative pedal input was steady on flat road. The car now has over 80,000 miles with new O2 Sensor and fuel economy restored to new.

I solved this one! Replacing an upstream Oxygen (O2) Sensor restored my fuel economy. 3.0L 2007 SEL AWD, so far replaced front upstream sensor. Nothing appeared wrong with any sensors (no codes) but yet my fuel economy went from 9 mpg city and 18 highway back to factory normal (about 18 city, upper 20s highway). I am waiting on another sensor from the dealer to replace the rear upstream sensor. I have searched the forums and google for this fuel economy problem for the last two+ years and every 'expert' almost unanimously says not to replace the O2 (Oxygen) sensors unless there is a code. I finally decided to buck the opinions to replace them and it worked. Background: Car when new had excellent fuel economy, but around 50,000 (K) miles fuel economy went down, and became worse over time. Strangely enough, using cruise control restored most of economy (about 10mpg+) even when comparative pedal input was steady on flat road. The car now has over 80,000 miles with new O2 Sensor and fuel economy restored to new.

I solved this one! Replacing an upstream Oxygen (O2) Sensor restored my fuel economy. 3.0L 2007 SEL AWD, so far replaced front upstream sensor. Nothing appeared wrong with any sensors (no codes) but yet my fuel economy went from 9 mpg city and 18 highway back to factory normal (about 18 city, upper 20s highway). I am waiting on another sensor from the dealer to replace the rear upstream sensor. I have searched the forums and google for this fuel economy problem for the last two+ years and every 'expert' almost unanimously says not to replace the O2 (Oxygen) sensors unless there is a code. I finally decided to buck the opinions to replace them and it worked. Background: Car when new had excellent fuel economy, but around 50,000 (K) miles fuel economy went down, and became worse over time. Strangely enough, using cruise control restored most of economy (about 10mpg+) even when comparative pedal input was steady on flat road. The car now has over 80,000 miles with new O2 Sensor and fuel economy restored to new.