- #318 of 377
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Re: MPG expectations not there yet. [lcostantino]
by sbsteggs
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Feb 20, 2009 (5:02 pm)
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Replying to: lcostantino (Feb 20, 2009 4:47 pm)
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.
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- #319 of 377
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Re: MPG expectations not there yet. [sbsteggs]
by 5_more
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Feb 20, 2009 (8:07 pm)
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Replying to: sbsteggs (Feb 20, 2009 5:02 pm)
...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?
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- #320 of 377
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Re: MPG expectations not there yet. [5_more]
by sbsteggs
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Feb 20, 2009 (8:18 pm)
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Replying to: 5_more (Feb 20, 2009 8:07 pm)
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.
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- #321 of 377
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Re: MPG expectations not there yet. [sbsteggs]
by 5_more
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Feb 21, 2009 (7:11 am)
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Replying to: sbsteggs (Feb 20, 2009 8:18 pm)
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.
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- #322 of 377
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Re: MPG expectations not there yet. [sbsteggs]
by coolmazda5
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Feb 21, 2009 (10:35 am)
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Replying to: sbsteggs (Feb 20, 2009 4:11 pm)
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
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- #323 of 377
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Re: MPG expectations not there yet. [sbsteggs]
by athenasius
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Feb 21, 2009 (3:06 pm)
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Replying to: sbsteggs (Feb 20, 2009 4:11 pm)
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. 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.
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- #324 of 377
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Re: MPG expectations not there yet. [athenasius]
by 5_more
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Feb 21, 2009 (5:44 pm)
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Replying to: athenasius (Feb 21, 2009 3:06 pm)
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.
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- #325 of 377
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Re: MPG expectations not there yet. [5_more]
by sbsteggs
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Feb 21, 2009 (7:13 pm)
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Replying to: 5_more (Feb 21, 2009 5:44 pm)
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.
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- #326 of 377
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Re: MPG expectations not there yet. [sbsteggs]
by 5_more
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Feb 22, 2009 (5:12 am)
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Replying to: sbsteggs (Feb 21, 2009 7:13 pm)
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)
altitude
??
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- #327 of 377
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Re: MPG expectations not there yet. [5_more]
by bobw3
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Feb 22, 2009 (10:18 am)
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Replying to: 5_more (Feb 21, 2009 7:11 am)
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.
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