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Mazda3 Real World MPG



  • kmh3kmh3 Posts: 35
    I am somwhat schooled in hyper mile techniques, sidewall max PSI in tires,
    shut off the engine at long lights (you can put it in neutral and stop the engine).
    Maintain momentum at all costs, use very gentle accelleration, and over all just slow down.

    I wanted to see what this car could do if I babied it as best I could, and compared that
    to more normal (but not exactly fast) driving.

    My mpg results so far (after a few weeks of experimentation):

    @70mph cruise on a flat, no air - about 42 mpg, with air - about 32 mpg.
    If I cycled the air by hand I could get 36 mpg (50% on/off).
    Give it some gas (but not much) and closer to 36 mpg@70mph (no air).
    Slow to 65 and draft a bit (no cruise), I sustained 46+ mpg for 100 miles, didn't try with air.
    City with all the babying I could manage, I can average 32 mpg (no air).
    City (give it some gas - but not much) about 26 mpg (no air).

    The highway miles were confirmed by fillup measurements,
    city mileage is just from the trip computer.

    Overall I think these are fantastic results, except the air is a pig.
  • m6userm6user Posts: 2,952
    That is a huge decrease in MPG with the air. I wonder if the smaller engines are affected more by having the A/C on? It seems with all the V6s I've had over the years the A/C had only a very minor maybe 2 mpg or so. Even with our Mazda 4cyl I don't recall it being affected anywhere close to what you're experiencing.
  • roadburnerroadburner Posts: 6,286
    My 2007 Mazdaspeed 3 returns 31 mpg at a steady 70 mph cruise with the A/C on automatic- and my 215/45-18 tires are inflated 34F/32R per the tire placard on the door jam.

    2009 328i / 2004 X3 2.5/ 1995 318ti Club Sport/ 1975 2002A/ 2007 Mazdaspeed 3/ 1999 Wrangler/ 1996 Speed Triple Challenge Cup Replica

  • Wow you saw that large of a drop with AC? I barely see any drop when I use the air. My last road trip with four people (including myself), as much luggage as you can fit into the 3 hatchback, driving 75mph constant and AC on the whole time got me 35mpg.

    I normally get between 37-39mpg per tank on my weekly commute and haven't seen that AC makes any difference.
  • kmh3kmh3 Posts: 35
    edited July 2012
    I want to retract my previous claim that using the air drops mpg by 10mpg.

    It does drop that much when you first engage the air, but the average mpg doesn't drop any where near as much, maybe 3-4 mpg instead of the 10 I thought I was seeing previously.

    That means this car has no bad points for me, the air is nice and efficient although not super powerful, exactly what you would want in a car tuned for high mpg.

    I wish I could edit my previous post to remove bad info.
  • A drop of 3-5 mph when the a/c is engaged is about what I'm accustomed to seeing with my '05 Mazda 3i w/5-speed manual also.

    The a/c compressor seems to consume most of the torque produced by my 3i's 2.0 L engine, especially at low rpm. If the compressor engages while I'm accelerating or climbing a hill below 2.5k rpm the feel is comparable to driving w/the emergency brake engaged or as if the car may be towing a trailer. At higher engine speeds the a/c compressor's effect is less noticeable, but I can still view the negative effect on my Scangauge II's instantaneous and average calculated mpg results. If engine rpm is below 2k my car simply falls on its knees when the a/c compressor engages.

    I'd like to see Mazda and other manufacturers begin to offer a/c compressors powered electrically vs. directly by the engine (rpm dependent) like Toyota is using on its hybrid vehicles like the Prius.
  • ex_tdierex_tdier Posts: 273
    edited August 2013
    I was just curious to see if Edmunds had any archived info on what the "average" real world numbers were for my model. The numbers really are all over the place. Although we are a Mazda family with the wife opting for the 2006 sporty 2.3 5 speed with 17 inch wheels, we get very similar mileage in the city. However, there is a big difference in highway driving. She has a 5 speed auto while I have the 4 speed automatic.

    All my mileage is done by hand or calculator. No mileage computer on my Mazda. Over the years I averaged about 12.5 litres per 100 km or 19 US mpg/22 mpg Canadian on a tank with doing 95% city driving in the morning and and afternoon. Average speeds about 30 km/h (19 mph).

    What bugs me is how the average speed attained is always missing when people are quoting their fuel consumption. On 100% highway driving I recently got ~ 9.0 litres/100 km or 26 mpg after an intake best so far. Average highway speed of ~ 90 km/56 mph as logged by my Garmin.

    The mileage I attained and even my wife comes no where near what are the "official government" numbers. In Canada, we were not affected by the overinflated numbers you folks in the US had. But I think we were but nobody has ever challenged Transport Canada who did the ratings.

    The official numbers for my Mazda3 is city: 9.1L/100 km (26 US MPG); 6.4L/100 km (37 US MPG). I personally never heard of anyone ever getting 6.4 L/100 driving this model. Clearly the numbers are skewed and overinflated by the official government agency.

    In short, the Mazda3 fuel numbers have historically not been good. SkyActive is an option for many, but from what I understand at a cost of power and performance. The materials are also of a lighter nature helping making the vehicle be lighter, thereby improving fuel economy.

    The point of my post? Perhaps someone who is in the market for a used Mazda3 might come across this thread and post for some info. For others, in addition what was already brought up eg. engine size, tire size, automatic or manual transmission, please post additional info like average speeds when quoting your fuel economy. It will help others get a more accurate idea of what kind of driving you really do, despite you writing 75 city/25 highway, etc.
  • scwmcanscwmcan Niagara, CanadaPosts: 393
    All I can say is it must be the automatic that is resulting in your bad milage. We constantly get 6.2 l/ 100 km on our 2007 Mazda 3 hatchback with the manual at normal highway speeds (120 km/ hr). This model was as I recall rated at 6.9 l/ 100 km by the gov. We also get better than your reported results for the city ( and we have the 2.3)
    As for the sky active engine, it should give similar if not slightly better performance compared to your current car, with much better fuel economy.
  • boyceboyce Bossier City, La.Posts: 48

    2012 Mazda 3 Skyactive 6 auto. We have gotten some good mileage on the interstate. Recent trip from Bossier City La. to San Antonio Tx. Car delivered 38 mpg on this trip. We hit stop and go traffic on the interstate all the way from Houston to San Antonio. Really nerve wracking. We got 42mpg going to Little Rock and back to Bossier so I'm OK with highway mileage. Around Bossier with much stop and go and short trips, my wife is only getting 23 mpg. When I had my Protégé, I was getting that mileage with it around town. Only have 4000 miles on car so I hope city mpg rises some as we get more miles. Overall I really like the car. Back seat room is sparse but I knew that going in. It's good for the two of us.

    2012 Mazda 3 Skyactive 6spd. auto 2008 Mazda Tribute S 4spd auto.

  • PF_FlyerPF_Flyer Pennsylvania Furnace, PAPosts: 5,854

    @boyce said: 2012 Mazda 3 Skyactive 6 auto.

    Good recap of your experience so far! 4,000 miles is hardly a blip, so hopefully you will start getting a bit more out of it as you shake things out.

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  • boyceboyce Bossier City, La.Posts: 48

    PFlyer, Thanks for response. In my post I said Houston to San Antone, but I meant Austin to San Antonio. We hit Austin about 3 in the afternoon and it was gridlock all the way to SA. I think the city mpg will improve as the 3 breaks in. I only get to drive on the roadtrips. The wife is constantly on the gas and brakes alternately around town. Constructive criticism not allowed.

    2012 Mazda 3 Skyactive 6spd. auto 2008 Mazda Tribute S 4spd auto.

  • PF_FlyerPF_Flyer Pennsylvania Furnace, PAPosts: 5,854
    edited December 2013

    @boyce said: The wife is constantly on the gas and brakes alternately around town. Constructive criticism not allowed.

    Everybody drives differently, hence the very true phrase... your mileage may vary

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