# Better gas mileage for cx7 **URL:** \ **Category:** General Discussion\ **Created:** [March 27, 2021, 5:33pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846 "2021-03-27T17:33:06Z")\ **Posts on this page:** 9\ **Page:** 2
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [March 28, 2021, 9:04pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/21 "2021-03-28T21:04:50Z")
> [@texases](#): > > Where’d he say that? He didn’t. What he said was (emphasis added) > [@Andy-Ke](#): > > Prior to that I got 20 mpg **in the city** for my CX7. This is pure speculation on my part but I suspect the OP is referring to **averages** and that his average mpg over multiple tankfulls has gone from 20 to 21.5. That’s a difference of 7.5% and certainly noticeable. ---
**Author:** ![Andy-Ke](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/andy-ke/32/41664_2.png) [@Andy-Ke](https://community.cartalk.com/u/Andy-Ke)\ **Post date:** [March 28, 2021, 9:14pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/22 "2021-03-28T21:14:47Z")
You are right. My figures are averages over about 3 yrs of driving. This is interesting. [http://www.mpgenhance.com/oxygensensor.html](http://www.mpgenhance.com/oxygensensor.html) ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [March 29, 2021, 12:09am UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/23 "2021-03-29T00:09:03Z")
> [@Andy-Ke](#): > > You are right. My figures are averages over about 3 yrs of driving. > > This is interesting. > > [http://www.mpgenhance.com/oxygensensor.html](http://www.mpgenhance.com/oxygensensor.html) Yes it is but it implies your oxygen sensor has been marginal for at least three years if your mileage has remained steady. It should have decreased and then rebounded when the new sensor was installed. What prompted the replacement? ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [March 29, 2021, 12:11am UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/24 "2021-03-29T00:11:32Z")
> [@Andy-Ke](#): > > You are right. My figures are averages over about 3 yrs of driving. Then you might need another 3 year average to know if the sensor actually gave you an increase in mileage . ---
**Author:** ![Andy-Ke](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/andy-ke/32/41664_2.png) [@Andy-Ke](https://community.cartalk.com/u/Andy-Ke)\ **Post date:** [March 29, 2021, 4:55pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/25 "2021-03-29T16:55:25Z")
Check engine light. ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [March 29, 2021, 9:12pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/26 "2021-03-29T21:12:26Z")
Is it still on, and what are the codes? ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [March 30, 2021, 12:27am UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/27 "2021-03-30T00:27:52Z")
> [@jtsanders](#): > > Is it still on, and what are the codes? The OP says the check engine light was the reason the oxygen sensor was replaced. I would hope it’s no longer lit. ---
**Author:** ![Andy-Ke](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/andy-ke/32/41664_2.png) [@Andy-Ke](https://community.cartalk.com/u/Andy-Ke)\ **Post date:** [March 30, 2021, 2:28am UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/28 "2021-03-30T02:28:00Z")
> [@jtsanders](#): > > Is it still on, and what are the codes? After replacement of 02 sensor, the trouble code no longer showed. ---
**Author:** ![TomTaylor](https://avatars.discourse-cdn.com/v4/letter/t/ce7236/32.png) [@TomTaylor](https://community.cartalk.com/u/TomTaylor)\ **Post date:** [March 30, 2021, 12:41pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/29 "2021-03-30T12:41:40Z")
Everything will get lower mpg in cold weather because of the thickening of the oil and the more time it takes to be efficient. Highway mpg should not be affected unless it’s a real windy day. Actually engines Run better on cold air so in the winter if you do a lot of highway driving you might see an increase of mpg [Previous page](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846.md?page=1)