Fuel efficiency issue?

[sidfarazste]

I'm using a 2024 GT CX-5.

Recently met with an accident which resulted in replacing hood and front bumper completely.

Before giving my car to collision center for repairs, the fuel efficiency was great. On a full gas tank, it used to give me ~650kms range. When compared with kms on odometer, the range was accurate.

But after receiving my car after repairs, I see difference between the kms on odometer and fuel range.

The google maps, from point A to point B, shows 30kms. The odometer shows +30kms but the range drops by atleast ~45kms.

If vou see, point A to B Odometer - (41804- 41774) = 30kms Fuel range- (602-560) = 42kms

I tested this over a week. 1 full gas refill would last me 1week but now I need to refill twice a week.

I would like to see if anyone has experienced similar and how they fixed it.

 

[N7turbo]

You sure you were getting 650 km per tank? Is this all highway miles? I have never gotten that and I've been driving CX-5's since 2014, but I am not an all-highway driver. If so, that's great as it's around 32-33 mpg. Well above average.

Normally the CX-5 gets around 500km between fill-ups or 26 mpg average.

 

[sidfarazste]

You sure you were getting 650 km per tank? Is this all highway miles? I have never gotten that and I've been driving CX-5's since 2014, but I am not an all-highway driver. If so, that's great as it's around 32-33 mpg. Well above average.

Normally the CX-5 gets around 500km between fill-ups or 26 mpg average.

Yes. I have been observing very keenly. My everyday run, mostly on highway 401, is around 110-120kms. One refill would easily last me a week or atleast 6 days.

 

[N7turbo]

I can get that mileage on the highway. But I'm not on the highway full-time, so my average is in line with most others. 300-325 miles per tank.

Keep in mind that range is just an estimate based on current fuel use rate and speed and will vary a lot.

That said, if your fuel consumption has really gone down and this isn't just a reading error, it's possible that your computer is relearning like when it was new. See if it returns to normal automatically within a week or two.

 

[sidfarazste]

I can get that mileage on the highway. But I'm not on the highway full-time, so my average is in line with most others. 300-325 miles per tank.

Keep in mind that range is just an estimate based on current fuel use rate and speed and will vary a lot.

That said, if your fuel consumption has really gone down and this isn't just a reading error, it's possible that your computer is relearning like when it was new. See if it returns to normal automatically within a week or two.

Okay. I'll see if it returns to normal.

Question:
After replacing front bumper along with sensors, does the system/software needs to recalibrate? If yes, how do I check if the calibration is done correctly?

Home to office is just 8.3kms but the driving range went down by 18kms . Strange. Drive is within 50-60kms speed limit.

 

[SparkYellow]

This is very interesting! I didn't know that collision repair can impact fuel economy. I suppose newer/smarter Mazdas take into account more than just fuel and distance in the calculation. For my old school 2017 Mazda, the only time I notice a big change in fuel economy is after a battery disconnect-connect, and it's always been an increase, not decrease.

Following to learn more.

 

[stickerbush]

the only time I notice a big change in fuel economy is after a battery disconnect-connect, and it's always been an increase, not decrease

It seems possible that the battery would be disconnected when the front-end damage was repaired.

 

[youri]

It is possible they caused an issue with the active grill shutter, but it is more likely just the computer relearning the range estimate.

Other possible options would be if they didn’t reassemble the air intake properly.

 

[SparkYellow]

It seems possible that the battery would be disconnected when the front-end damage was repaired.

If you have been driving the same way (speed/distance/freeway/local) after the battery reconnect, the new estimate should be higher than the prior figure since it was an average over a longer period of time. It also doesn't take the computer that long to recalculate. It is probably more, like what's been noted above. Intake should be easy to check, not sure about the shutter tho.

 

[N7turbo]

CX-5 doesn't have the active shutters.