# 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:** 20\ **Page:** 1
**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 27, 2021, 5:33pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/1 "2021-03-27T17:33:06Z")
I had an oxygen sensor replaced. Prior to that I got 20 mpg in the city for my CX7. Now I am getting 21.5 mpg. Could that increase be due to the replacement of the O2 sensor? Thanks. ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [March 27, 2021, 5:51pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/2 "2021-03-27T17:51:09Z")
Yes it could. Warmer weather could also be part of it. ---
**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 27, 2021, 7:43pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/3 "2021-03-27T19:43:02Z")
> [@Andy-Ke](#): > > Prior to that I got 20 mpg in the city for my CX7. Only got 20MPG ? Every time ? Must be something wrong with my vehicle because I get a range from 31.4 to 35.3 and sometimes more or less than those. Also it is about time for the fuel mixture to change from cold weather to warmer . ---
**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 27, 2021, 8:04pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/4 "2021-03-27T20:04:27Z")
Yes every time. I get 28 hwy when using the cruise control. My 2009 has a 2.4 Liter turbo charged. Sounds like your cx7 must be newer or have smaller engine Here are the specs. 2009 Mazda CX-7 · Specs Overview MSRP $23,900 - $28,400 · Fuel economy Up to 17/23 mpg (city/highway) ---
**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 27, 2021, 8:17pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/5 "2021-03-27T20:17:32Z")
Thanks for the info. Do cars get lower mpg in colder weather? ---
**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 27, 2021, 8:25pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/6 "2021-03-27T20:25:04Z")
> [@Andy-Ke](#): > > Do cars get lower mpg in colder weather? Yes they do . Which is why I suspect you are not checking your miles per gallon the proper way . Very few vehicles get the same MPG every tank and most do not exceed the city / highway rating every time. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [March 27, 2021, 8:45pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/7 "2021-03-27T20:45:01Z")
Your mpgs sound about right. Folks with the 2009 average 18 mpg on Fuelley: [Mazda CX-7 MPG - Actual MPG from 123 Mazda CX-7 owners (fuelly.com)](https://www.fuelly.com/car/mazda/cx-7?engineconfig_id=34&bodytype_id=&submodel_id=) ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [March 27, 2021, 8:49pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/8 "2021-03-27T20:49:37Z")
> [@VOLVO-V70](#): > > Must be something wrong with my vehicle because I get a range from 31.4 to 35.3 In a CX-7? A car that big gets 35mpg? ---
**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 27, 2021, 9:10pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/9 "2021-03-27T21:10:45Z")
If you do the same sort of driving, same routes and driving habits, your mpg will be fairly consistent. Not necessarily spot on but within a fairly narrow range. Mine certainly is. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [March 27, 2021, 9:23pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/10 "2021-03-27T21:23:11Z")
> [@davepsinbox\_157004](#): > > If you do the same sort of driving, same routes and driving habits, your mpg will be fairly consistent. Not necessarily spot on but within a fairly narrow range. Mine certainly is. +1 While it varies a bit depending on the season, within a season my gas mileage varies very little, probably because my driving patterns and behaviors are quite consistent. As an example, in local driving, my mileage in the winter is 23-24 mpg, but once the weather warms-up, my mileage for local driving is almost always in the 25-26 mpg range. For longer trips, no matter what the season might be, my typical mpgs are in the 27-29 range. ---
**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 27, 2021, 9:42pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/11 "2021-03-27T21:42:36Z")
> [@asemaster](#): > > In a CX-7? A car that big gets 35mpg? I said my vehicle ( I don’t have a CX7 ) . The point being that it is rare that someone gets the same MPG every time and exceeds the rating every time . Which goes back to I doubt if he is checking his MPG correctly since he asked if winter weather reduced miles per gallon. ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [March 27, 2021, 10:00pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/12 "2021-03-27T22:00:50Z")
> [@VOLVO-V70](#): > > I said my vehicle ( I don’t have a CX7 ) . Oh, I see. I rarely bother to check mileage by dividing miles by gallons anymore. I just use the readout on the instrument panel. Whether it’s accurate or not isn’t important, just that the reading is consistent. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [March 27, 2021, 10:04pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/13 "2021-03-27T22:04:51Z")
> [@asemaster](#): > > I just use the readout on the instrument panel. Whether it’s accurate or not isn’t important, just that the reading is consistent. +1 I consider the mpg readout to be a “cheap and dirty” diagnostic tool. If it took a nosedive, and if I hadn’t been in stop & go driving, that would indicate a possible problem, IMHO. But, after doing repeated comparisons of the readout with actual paper & pencil calculations, I have confirmed that the readout is a consistent .4 mpg optimistic. That’s close enough for me. ---
**Author:** ![asemaster](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@asemaster](https://community.cartalk.com/u/asemaster)\ **Post date:** [March 27, 2021, 10:09pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/14 "2021-03-27T22:09:14Z")
> [@VDCdriver](#): > > I have confirmed that the readout is a consistent .4 mpg optimistic. That’s close enough for me. Sounds about dead on. I mean, when was the last time your pencil was calibrated? 😆 ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [March 27, 2021, 10:15pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/15 "2021-03-27T22:15:42Z")
Yes, a lot lower. ---
**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, 3:50am UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/16 "2021-03-28T03:50:30Z")
> [@VOLVO-V70](#): > > Yes they do . Which is why I suspect you are not checking your miles per gallon the proper way . Very few vehicles get the same MPG every tank and most do not exceed the city / highway rating every time. I know how to check my mpg. Been doing it over 40 yrs. Who said anything about getting the same mpg every tank? 🙂 ---
**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, 3:53am UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/17 "2021-03-28T03:53:33Z")
That’s impressive that the gauge is so accurate compared to manually calculating mpg . 🙂 ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [March 28, 2021, 2:09pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/18 "2021-03-28T14:09:14Z")
> [@VDCdriver](#): > > I have confirmed that the readout is a consistent .4 mpg optimistic. Better than my Hyundai, which is 7% optimistic. I stopped doing manual calculation after the first few months. On a road trip getting a real 30 mpg it displayed ~32. Puttering around town in the winter getting 20 mpg it displayed ~21.5. ---
**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 28, 2021, 3:01pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/19 "2021-03-28T15:01:49Z")
> [@Andy-Ke](#): > > I know how to check my mpg. Been doing it over 40 yrs. Who said anything about getting the same mpg every tank? 🙂 You did by stating one number for city and one for highway and then asked if colder weather reduced mpg. If you were checking you would have a range from low to high . ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [March 28, 2021, 8:25pm UTC](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846/20 "2021-03-28T20:25:38Z")
> [@VOLVO-V70](#): > > You did by stating one number for city and one for highway Where’d he say that? [Next page](https://community.cartalk.com/t/better-gas-mileage-for-cx7/175846.md?page=2)