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post #391 of 462 (permalink) Old 10-17-2017, 12:10 PM
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@tickerguy and dasrider,

Thanks for the input. If a dragging caliper is the issue, I'm sure it'll be evident in the way the car drives/moves and I should've noticed it. Unless this is something common with this car? I will check the brakes/rotors/caliper to double check.

29mpg I can understand but 21-25 seems a little low when it's rated much higher. Any other ideas guys? I've also changed the air filter and checked spark plugs. I only use chevron/shell and have driven like a student driver over the 3 fill ups to test. Mostly 80% highway.
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post #392 of 462 (permalink) Old 10-17-2017, 12:31 PM
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1. Never trust what the computer reports for MPG or average MPG. Those are arbitrary numbers and can easily be skewed if you tend to idle a lot or drive mostly/all city.

2. Dragging brakes and low air pressure are the biggest reasons for lower than expected gas mileage.

3. Driving habits are next on the list, be honest with yourself. I can get amazing mileage in my 04 V6, but even driving spirited for 15 minutes will consume a tremendous amount of gas for the miles traveled.

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post #393 of 462 (permalink) Old 10-17-2017, 12:42 PM
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Originally Posted by b1lk1 View Post
1. Never trust what the computer reports for MPG or average MPG. Those are arbitrary numbers and can easily be skewed if you tend to idle a lot or drive mostly/all city.

2. Dragging brakes and low air pressure are the biggest reasons for lower than expected gas mileage.

3. Driving habits are next on the list, be honest with yourself. I can get amazing mileage in my 04 V6, but even driving spirited for 15 minutes will consume a tremendous amount of gas for the miles traveled.
Absolutely everything this man said. I can't emphasize #3 enough, either. If I really try, I can still get 40mpgs with this car so long as I'm not in traffic. On the other hand, I can easily get under 15mpgs if I'm having a good time.

The biggest things, I've found, are minimizing the amount of full stops you come to (especially while in traffic), and throttle consistency. Predicting when lights/traffic will go, and rolling to them so you don't full stop is a huge benefit. Holding the throttle in the same spot and predicting when you can let off for hills/etc is essential to getting good mpgs.

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post #394 of 462 (permalink) Old 10-17-2017, 02:27 PM
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Oh it's entirely possible to drive a 3rd Gen 6 so it gets 25mpg. :-)

However, I'd still check for dragging calipers. They will do a crazy amount of damage to fuel economy and it's an extremely common problem. There is often no real indication while driving (like a pull to one side), especially if the problem is on the rear wheels.
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post #395 of 462 (permalink) Old 10-17-2017, 10:05 PM
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Thanks for the input and yes I'm totally aware of all the little things here and there that can come into play that will affect the gas mileage. Keep in mind guys I did say I'd driven this car like a granny during these 3 fill ups and have reset the calculator to account for idle/stops. The mileage and fill up justifies the dash which has shown a range of 22.7-24.3 from what I can remember.

My biggest gripe is what if I was driving it like a normal person. What if I had a spiritual drive inbetween... I don't expect anything above 20mpg if currently I'm not even getting anywhere above 25mpg.

I'm waiting on that oil/fuel filter change and I will see if it helps at all. Otherwise... hmm..
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post #396 of 462 (permalink) Old 10-18-2017, 12:36 AM
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Well I have run my first full tank through the car (2003 2.3L(; a trip to Milwaukee and a weeks worth of 70 mile round trip work commutes gave me 27.8.
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post #397 of 462 (permalink) Old 10-18-2017, 08:58 AM
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Check those calipers!

You can see my fuelly records on my '15 MTX. I do NOT drive like Granny, and I've got over 100,000 miles on the clock, with every single tank recorded since I drove the car off the lot brand new.

I DO get tanks in the 29-30 range but they're caused by conditions I know are ugly on mileage (sitting in a parking lot with the AC blasting for 10-15 minutes to cool off after a run returns zero mileage but does consume fuel, for example :-))

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post #398 of 462 (permalink) Old 10-18-2017, 09:02 AM
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Quote:
Originally Posted by tickerguy View Post
Check those calipers!

You can see my fuelly records on my '15 MTX. I do NOT drive like Granny, and I've got over 100,000 miles on the clock, with every single tank recorded since I drove the car off the lot brand new.

I DO get tanks in the 29-30 range but they're caused by conditions I know are ugly on mileage (sitting in a parking lot with the AC blasting for 10-15 minutes to cool off after a run returns zero mileage but does consume fuel, for example :-))

Mazda 6 Sport MT (Mazda 6) | Fuelly
What he said. A stuck caliper pin will ruin your MPGs (not to mention your pads/rotors) and they're not all that uncommon.

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post #399 of 462 (permalink) Old 10-18-2017, 10:00 AM
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Interesting. I picked my 2014 up a few months back with about 97k on the clock. I've swapped out the front pads and rotors and it was more difficult than it should have been to remove the caliper pins. They were pretty dry making me think they probably had not been serviced in a while or at all. I can only assume the rear hardware is still original and in similar shape, but I don't know for sure.

I want to replace the rear pads and service the calipers as well, but I'm waiting on Mazda to contact me regarding the rear caliper recall. I'd like for them to replace the caliper(s) altogether if possible. I've already contacted the local Mazda dealer and they still don't have the parts in though. My mpg isn't horrendous at low-29ish mostly city, but even when I've done some longer trips on the highway I can't see it getting anywhere near what this thing was originally advertised for.
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post #400 of 462 (permalink) Old 10-18-2017, 10:42 AM
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Well if you drive 80mph you won't get anywhere near what it was originally advertised for.

Note that the EPA highway mileage is taken at 65mph. 80mph, which is pretty common for many people to drive, results in materially higher air resistance -- which is where the vast majority of what degrades your mileage comes from.

I have had full tanks in which I've broken 40mpg (~41ish) when I have been driving in areas where due to road conditions or speed limits and heavy enforcement I've chosen to lock the cruise control at 60mph. That reminds me (a lot!) of the double-nickel days in terms of boredom and travel time, but it also results in mileage results that exceed the published numbers, so there you are.
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