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Discussion Starter · #1 ·
So it's been a while but now I have a new concern:|:

As I mentioned in a post somewhere else, I just took my 2014 3 sGT to my dealership for a 35k service and brake replacement. Upon its return everything seems alright however one thing is different. I usually keep my "info" pane on the "current" mpg calculator. Since the service, the mpg numbers I am getting are completely different than what I have seen in the first couple years of ownership. Common numbers I see now are under 10, then 20 and then finally jumping to over 30 when I finish acceleration. The only time I would see such numbers are when I flip the sport mode on or would really lay into the gas. My RPMs never rise above 4, maybe not even 3000. The numbers seem normal at higher speeds but are extra low in the lower gears. Also I have the mpg trip info appear when I turn off the car. These numbers have been strikingly low as well. Trips that I could pull 40 came in at around 24. My driving habits are very consistent. My normal mpg avg is 29.5 to about 31. Additionally my car feels to drive and handle the same way.

However, my avg info display is reporting 29.7mpg. The information appears to be quite contradicting. I've had my car back for a week now and I'm still doubting. I recently grabbed a full tank and will compare my consumption when I empty and continue to monitor throughout.

I am unsure how this information is calculated and am wondering if I should try to reset the comp by unplugging the battery or try some other method. Other things I am wondering are if I should try to clean the MAF though it's still only 35k old car. After reading about the TSB for brakes, I also consider if while being serviced, something was either broken, or corrected that would cause these differences. I'm just looking for input and advice. Thank you all!

Also while having my vehicle serviced, I was loaned a 2017 CX-5 touring. That car is something else... If that was available when I picked up my car, I might not have a 3 right now. Also it was so quiet; such a remarkable difference in road noise from the 3. It was nice talking at inside voices level. Would get one if not for the wedding we are trying to afford.
 

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MazdaLows said:
"My normal mpg avg is 29.5 to about 31. Additionally my car feels to drive and handle the same way. However, my avg info display is reporting 29.7mpg."
If I am understanding this correctly, there is not much difference in the two, e.g., an average of 30.25 MPG from your mathematical calculations from your actual gas purchase receipts, vs. 29.7 MPG from your info display. If so, not only are the two only 2% apart, but you are actually getting higher average fuel mileage than your digital display shows..

What you are sharing is rare, for most of us when we compare our digital readings, across brand after brand, and comparing those car-reported readings to our gas slips, most are complaining (and filing complaints against the manufacturer -- more than a few successfully), because the digital display are so often 5-10+% more than the actual gas slips show.

Again, if I am understanding your post correctly...
 

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I don't see an issue. You are worrying about less than 2 mpg in the long term average. Its possible (probable) that the monitors got reset during the service. Did the info system get updated to .502?
 

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Discussion Starter · #4 ·
I think I may have elaborated too much on a detail rather than my issue. My primary concern is that my digital instruments are reading differently while I am driving. This is the second by second updating of my current mpg. Before, I would see something like 15, 22, 26, 31, 33, 42. Now over the same span, I see something of 4, 8, 11, 15, 22, 42. I'm more interested in the dramatic change in numbers.

It is only a contradicting statement that my mpg from other on-board calculations remain mostly the same.

This is just a hugely distracting change that I was wondering if anyone had any experience on. My first assumption is that something is wrong. Like arathol mentioned, perhaps a software update that changed calculations in an attempt to be more accurate. My report didn't mention anything of a change. My OS is 55.00.650.

I apologize for the poor clarity in my initial post.
 

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I was loaned a 2017 CX-5 touring...such a remarkable difference in road noise from the 3. It was nice talking at inside voices level.
Did you happen to notice which tires were on the CX-5?

This is from the current Car and Driver review of the 2017 Mazda CX-5 AWD:

"The new CX-5’s interior is noticeably quieter, too, with our sound-level meter registering just 67 decibels at 70 mph, or one decibel lower than a Mercedes-Benz GLC300 4MATIC."
 

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Discussion Starter · #6 ·
Did you happen to notice which tires were on the CX-5?

This is from the current Car and Driver review of the 2017 Mazda CX-5 AWD:

"The new CX-5’s interior is noticeably quieter, too, with our sound-level meter registering just 67 decibels at 70 mph, or one decibel lower than a Mercedes-Benz GLC300 4MATIC."
Had to look at a picture I took of it. Looks like Yoko's Geolandar G91s? There's one highway nearby that is particularly loud to where I need to really project to be heard in my 3. I didn't need to go that way but that would have been a real test.
 

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Had to look at a picture I took of it. Looks like Yoko's Geolandar G91s? There's one highway nearby that is particularly loud to where I need to really project to be heard in my 3. I didn't need to go that way but that would have been a real test.
Thanks.

I don't know if they're comparable or not, but I've got Yoko Geolandar H/T G056s on my Tundra, and they're very quiet.
 
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