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Mazda5 Owners MPG-Real World Numbers



  • thanks for the insight. Hopefully it's just old gas then. I'll update when I run it dry and get some fresh fuel in there.
  • I've owned my 2007 for a year and a half. Combined city/highway has always been around 17 MPG. The dealer says there's nothing wrong. I can't believe it's all due to my driving style; I'm just not that aggressive. Tire pressure is ok. Drives me crazy! I'd gladly make the car less powerful if it would save on gas.
  • WOW! 17mpg is pretty low for our MZ5s, what brand fuel are you using? Cheaply priced gas is usually poor quality as well, and does not yield as good MPG, IMHO. I know its difficult to dish out a little bit more money on higher priced (higher quality) gas because of our economic crisis status, but maybe that is the problem with your MZ5, or perhaps a faulty gas cap and/or a dirty air filter. What type of oil do you use? Stay with the reccomended 5W20 weight because this thin oil is recommended and put in place to improve fuel economy. Let us know if any changes.
  • I love your enthusiasm! I feel the same way toward this car. I simply LOVE it and LOVE to drive it!

    Anyway, recently came back from a road trip to North Carolina for the four-day weekend. I went up to 420 miles twice. And I filled up with 13 gallons. So, that gave me highway mileage of 32.30! Significantly higher than the 28 highway EPA figure! So, I'm very happy with that. I live in NYC, however, so my city mileage is lower than others: around 21, which is still accurate by EPA standards.
  • I use regular gas from Hess, usually, but occasionally I'll fill up at some random Sunoco. I doubt that can account for a 10MPG difference than most people. The car just had its 6000 mile service. What could be wrong with the gas cap?
    Until last week, I was using the OEM oil from the dealer. At the service visit I asked them to switch to synthetic. Haven't noticed any radical changes.
  • HMMM! Interesting....your MZ5 is fairly new too! 6K miles is very new, but not still within the break in period, which sometimes accounts for low MPG. I dont know about Hess gas (probably an East coast only station), but Sunoco does have good gas IMO. So that is out of the question. You just switched to Synthetic, which is usually a better oil and returns better MPG (as long as it is the same weight). Gas cap, if faulty would let vapor escape from gas tank, therefore, evaporating your gas more quickly. However, if that was the problem I am almost sure that the check engine light would go on. Also at 6K miles I dont think your air filter is dirty. I cant think of anything else that you or I have mentioned that would cause low MPG, besides ECM not programmed correctly or odometer malfunction. Do you have stock wheel and tire set up? How do you calculate your MPG's?
  • Last week, we took the car from Portland, ME to NYC & back. I averaged about 30 MPG. This was with 2 adults, 3 kids & a full luggage.
  • gokahogokaho Posts: 3
    I rented a Mazda5 automatic for the 3-day weekend. I drove 570 miles.

    On a 150 miles highway run (68-73 mph with AC on, myself and a dog) it averaged 33mpg.

    Urban driving, with 5 passenger (2/3 freeway driving, no stop & go traffic), it averaged around 28mpg.

    The entire trip/3 day average was 29.5 mpg
  • jonat1xjonat1x Posts: 34
    What company rents Mazdas?
  • I've seen them with Hertz and Enterprise
  • 01le01le Posts: 18
    I just got back from a round trip from San Diego to L.A. (230 mile total) and I got 30.4mpg averaging 68 mph. 3 adults and 5 pieces of luggage on board (full load), so I am very happy with my mpg results.
  • gokahogokaho Posts: 3
    I rented it from Enterprise Car Rental. The 3-day rental, with tax and fee (no buy up on insurance) was only $105, with unlimited miles for driving within a state.

    The trip covers between San Antonio and Houston, the driving condition covers mostly flat terrain. The temperature was in the low 70's.
  • I bought a new 2008 Mazda 5 in January 2009. I was really sold on the 22 city-28 highway mpg estimates. So far, on 3 fill-ups, i've got 19.5 , 20.5, and 20.5 mpg. My wife was doing most of the driving on the 1st two tanks, and i did most of the driving on the 3rd tank. Our driving would be considered 50% city, 50% highway. The city is really 40mph suburban.
    I was expecting an average of 24-25 mpg overall. Getting 20.5 has been disappointing. I did have a little trouble getting the gas cap off on the 2nd fill-up. I've noticed forums talking about a "break-in period", which i'm not familiar with. So i'm gonna take it into the dealer. I don't think expecting 24-25mpg from a brand new 4 cylinder in unreasonable. I have a 1994 Lumina APV 6 cylinder that is getting 16mpg.
    Any thoughts or comments would be appreciated.
  • Sbsteggs - not sure if your weather is an issue, or if you're driving it with a full load, or have a lead foot... I've got 33K on a 2007, the 4 speed automatic GT. I usually drive alone, and it's 70% fast freeway (70mph+) and the rest suburban streets. I've averaged 23-24 without fail, lowest was 20 and highest 27. They do a little better after "break-in" but not much. Do examine the other MPG factors. Good luck!
  • It was very cold on the 1st tank, but it has been warmer recently. 40's. I don't think my wife has a lead foot. I tried to drive the car as smart as possible on the last tank, being bothered by the MPG so far. I still got 20.5 mpg. We've been driving with no extra weight in the car. Thanks for the imput.
  • 5_more5_more Posts: 43
    ...I was disappointed when my winter mileage dropped to the 24-27 range -- in heavy snow and very cold temperatures (mixed suburban/city driving). I'm used to 29-31 nine months out of the year. (2008 5AT)

    Do you have a remote starter?
  • No remote starter. Just a plain 2008 Mazda5 Sport.
    The funny thing is, I was all set to buy a 2008 Sedona: but Bought the Mazda instead. The Sedona got very poor gas mileage customer reviews. I really wanted gas efficiency.
  • 5_more5_more Posts: 43
    Cylinder count of the engine isn't is a major factor in gas mileage. However, in stop-n-go traffic, and hilly areas, vehicle weight is -- and the 5 weighs about 3400 lbs -- or around 78% of what a Sedona weighs.

    Every time the brakes are applied, the gas mileage goes down -- as kinetic energy is turned to heat, and wasted.

    For fun, spend a few hours driving the speed limit, with the cruise control engaged, on relatively flat interstate (brakes not required to maintain speed), when there is little wind, with only one exit (to turn around). Top the vehicle off before and after a couple hundred miles. If your mileage isn't in the 32-35mpg range, I'd be surprised. Doing so would at least prove that there is nothing wrong with the car. If that is the case, your 20 mpg numbers can be accurately attributed to driving style and/or conditions.

    FWIW, my front tires are at 42 psi, and the back ones are at 40 psi.

    Also, the engine spins slightly faster, in 5th, on a manual transmission than it does with the 5 speed automatic. From reported numbers, the 5 speed automatic may actually get a little better gas mileage.
  • I own an 06 and an 08. While we regularly are in the 24MPG area, during Winter time I've noted 2-3MPG drop (and is not that cold sometimes either) so that may be part of the issue. And, as mentioned earlier, check your tire pressure just in case as that changes the MPG numbers radically
  • Two things that can affect your mileage greatly which have not been mentioned is it you have the auto type temperature control or if you have the defrost setting on. if you have the auto on and do not turn off or have the defrost setting on the a/c is on and will greatly reduce the mileage. Another one is the amount of ethanol percentage in the gasoline if you have 10% ethanol you will lose about 10% gas mileage.

    For me personally I tend to forget and tend to have fun driving. :blush: If you want to improve this kind of driving the old adage is to imagine a raw egg between your foot and the gas peddle.
  • 5_more5_more Posts: 43
    The ethanol point was worth making. I am not an ethanol fan -- for obvious reasons. Nonetheless, all of the mileage numbers that I've reported have been achieved with 10% ethanol blends. Unfortunately, I cannot buy real gasoline in my area.
  • I think there's a bottom-line here. The car isn't getting good MPG. I don't have a lead-foot, and just drive it normal. The MPG numbers aren't right. 20.5 mpg is not what I was expecting, but it's what i'm getting. You guys all make valid points, but it's been getting 20.5 since I drove it off the lot. In reading other forums, that's a good 4MPG off. About 20% lower. In my opinion, that's not right. Another thing with this car is that the brakes seem extremely touchy.
  • 5_more5_more Posts: 43
    Yes you are getting poor mileage, the question is why.
    The highway test will determine if there is a problem with the 5.

    What did you get for mpg on your previous vehicle, just before getting the 5? What percentage of that vehicle's EPA rating was that?

    Other factors...
    snow tires
    luggage rack (at least at highway speeds)
  • bobw3bobw3 Posts: 2,992
    Every time the brakes are applied, the gas mileage goes down -- as kinetic energy is turned to heat, and wasted.

    How does letting off the gas and pressing the brake reduce MPG? You could put the car in neutral and slam on the brakes or put the car in neutral and coast to a stop and the amount of gas used would be the same.

    Now what will use more gas is quick accelaration from traffic lights and stop signs. How you use the gas pedal, not the brake pedal is what will affect your MPG.

    Also, using defrost in really cold weather won't engage the AC compressor.
  • 5_more5_more Posts: 43
    How does letting off the gas and pressing the brake reduce MPG?


    Stopping a Mazda 5 from 60mph requires doing something with about 588kJ of energy.

    There are four options.

    1) turn it all in to heat with the brakes
    2) coast out, loosing the energy to wind drag and rolling friction, but gaining distance
    3) store it somewhere, such as rolling up a hill until you stop
    4) some combination of the above

    Assuming you eventually park in the same spot you started from, the only source for the 588kJ is the fuel in the tank. 588kJ is approximately the amount of energy in 0.6 oz. of E10 gasoline. Combustion engines are not that efficient, so in reality, it would take more than an ounce of fuel to replace than energy.

    If you chose to coast to a stop, in neutral, with the engine off, you'd have gained all of that distance for free versus the braking option.

    The store-it option is what a hybrid does, only instead of rolling up a hill, a battery is used. Well, actually, a battery, a pressure tank, or a flywheel is used depending on the type of hybrid. The stored energy is then spent to accelerate when the driver decides to go again.

    You could put the car in neutral and slam on the brakes or put the car in neutral and coast to a stop and the amount of gas used would be the same.

    Miles Per Gallon... In your example, you would indeed use roughly the same amount of gas. The difference is in the distance that you're getting for that gas -- gas that you already spent to achieve the speed you were traveling at. In the braking case, it a little over a hundred feet. In the coasting case, its well over a thousand feet further -- for free. Do that a few times, and you picked-up an additional mile for no added cost. The same concept works at any speed. It all adds up.

    The closer you can get to coasting out on every stop, the higher you gas mileage will be.
  • 5_more5_more Posts: 43
    How you use the gas pedal, not the brake pedal is what will affect your MPG.

    Both matter -- and the brake pedal far more than most people appreciate.
  • Hi, I am getting in on the tail end of this, although I would like to add a little something.

    I have a new 2009 mazda 5 sport auto trans. and I am getting overall approx. 25pmg (5 tankfuls so far). I live in northern ky and when I use the auto defrost the a/c always kicks in, so I turn it off (and it does get very cold here at times) so I have mentioned to my wife not to use the auto climate control whatsoever in the winter. Now the brakes were a bit touchy for my wife and I, but we adjusted as everyone does. I can't help but think if one gets 20mpg on the M5 then your probably safe to say that in the Sedona one would be averaging 3-4 mpg less as well?

    At any rate I would like to hear what comes about with this mystery...
  • bobw3bobw3 Posts: 2,992
    If you chose to coast to a stop, in neutral, with the engine off, you'd have gained all of that distance for free versus the braking option.

    Correct...coasting vs pressing will save you the gas...but the action of pressing the brake does nothing to your MPG. E=0.5mv^2 The energy lost is heat from brakes plus the drag of the engine (unless you're in neutral). Indirectly you're correct, but again it's not the action of braking saving gas, but if your are or aren't light on the gas pedal.

    I think you're confusing being light on the gas pedal and coasting with the action of pressing the brake. The former will give you better MPG.

    You should gradually accelerate after a stop sign or red light to improve MPG too. You don't want to zip off the line and then coast to a stop and think you'll get better MPG...that won't happen.
  • tomas_elantra ,
    Your Mazda5 is getting 25MPG in Kentucky, and i'm getting 20.5 in my Mazda5 after 4 fill-ups. I live near Buffalo, so it's colder. But 4.5 MPG colder?? I'll find out Wednesday when i take it in. Hopefully I don't get a song and a dance.
    As for "5 More's" comments, your way past me in breaking this down. Thanks for your imput though.
    Here's how I drive: 1. Don't burn out when taking off from a stop. 2. Accelerate just enough so the guy behind me isn't all over me. 3. Don't tail-gate. 4. I usually go the speed limit, or 5 to 10 over, depending on traffic flow. 5. Try to get off the gas and coast some when approaching a stopping situation.
    As for the Sedona, I really wanted it :cry: . I had a list of 5 values when I was shopping. MPG was on the list. An 8-10 MPG difference (assuming the Mazda5 would get 25MPG...HaHa) between the 2 cars resulted in me buying the Mazda. That 8-10 MPG difference adds up when the cost of gas shoots to $4 per gallon.
  • 5_more5_more Posts: 43

    Any time the brakes are used (wheel or engine braking), energy is lost in the form of heat. The source of that energy is in the gas tank.


    To really make you mad... I've been getting better gas mileage in my Sienna than you're getting in your Mazda. My Sienna gas mileage is about 5 mpg lower than my Mazda 5, both in the city and on the highway.
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