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Old 10-09-2022, 06:25 PM   #27 (permalink)
Master EcoModder
Join Date: May 2019
Location: California
Posts: 491

2020 - '08 Chevy Tahoe H
Last 3: 18.4 mpg (US)

2021 - '08 Chevy Tahoe H
90 day: 17.08 mpg (US)

2022 - '08 chevy Tahoe LT
90 day: 19.27 mpg (US)
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Originally Posted by kach22i View Post
I too noticed a drop in mpg with the switch to winter gas this year, new to me car so cannot compare to other years. However, it was a bigger drop than I ever noticed in my Geo Tracker and Chevy S-10 going back 30 years in memory collectively.

I unfortunately used twice a Shell gas station that was selling something else than Shell, just as bad as other gas stations.

If your car(s) use premium like my two cars (45 old Porsche, 10 year old Infiniti) the nitrogen additives in Shell make just as much of a difference as between summer and winter blends of gasoline.
i replaced both o2 sensor on bank2 it had a bad sensor causing issues with the DFCO and showing like 0.1volts randomly on sensor 2. when it should be 0.8v
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