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SUVs Mazda CX-9 Mazda CX-9 Real World MPG
140 messages, Last post on Feb 13, 2009 at 11:14 AM
You are in the Mazda CX-9 Forum. Your Hosts are steve_ & tidester
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I have got 850 km (530 miles) on the odometer of my 2009 GTX AWD. The trip computer (thanks Mazda for this improvement in the 2009 model!) shows that the average MPG is 19.8. City/highway - 40% / 60%. A/C is always on. Average number of passengers: 2. Terrain: flat. The car is still under 1000 km so I don't drive it too fast - max. 100 km/h (60 MPH). I am currently quite happy with this MPG, it's similar to what I get on the other car - a toyota camry 1998 V6 3.0L.
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Replying to: inliner (Sep 11, 2008 9:53 am)
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here it is http://www.carspace.com/pirogue/Albums/pirogue%27s%20Album/Oct01_0002.jpg/page/p- hoto.html#pic not sure how to use url function to make address smaller. |
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Replying to: pirogue (Oct 01, 2008 7:45 am)
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Sorry, I was happy when I seen the trip odometer and thought I has a special vehicle. I've been confused all this time. 
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Replying to: maltb (Oct 01, 2008 7:56 am) .
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Replying to: pirogue (Oct 01, 2008 8:11 am) In order for the miles/gallons method to be accurate, you have to fill up at the same station and, even better, the same pump between fill-ups. I have a ScanGaugeII installed and calibrated (with 4.4% error adjustment). So far, it has been very accurate within 0.2 gallons at fill-up (or ~0.2mpg) |
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Just filled up the tank for the first time. 16 mpg in urban traffic, not bad. Will average out over the next fill ups using "odo B" to keep track of eventual improvements. I know it is heresy, but comparing it to the Sienna minivan it replaces, the engine needs its revs to move. |
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Replying to: steve_ (Jul 07, 2008 6:15 pm) It dilutes the error rate. Let's say for example the pump you're using sometimes adds an extra 1/10 of a gallon of gas more or less. Adding that 1/10 of a gallon to a 2.5 gal fillup will create a 4% error (.1 / 2.5 x 100), while that 1/10 gallon pump error will only account for a 1% error on a 10 gal fillup (.1 / 10.0 x 100). Let's say your pump error is 1/2 gal because it's flowing faster or slower, more is released on the click, you're holding the pump slightly differently, etc. That 1/2 gal difference will create a 20% error on a 2.5 gal fillup vs only a 5% error on a 10 gal fillup. It's basic statistics. The larger the sample size (i.e. the quantity of the fillup) increases accuracy (eg MPG for that fillup). That's also why scan gauge really isn't accurate for snapshot MPG ratings, since MPG is Miles Per Gallon and if the car only moved a few feet and scan gauge tried to calculate a Miles Per Gallon number based on a few feet of driving, it wouldn't be very accurate in comparison with calulating a MPG over a hundred mile range. So if Scan Gauge calculates that it took 0.023 gal to travel 6ft that would equal 20.24MPG (0.023 x 5280 / 6), but if Scan Gauge was 1/100 of a gallon off and the actual amount used was 0.033 instead of 0.023, then the MPG would actually be 29.04MPG, so by being 1/100th of a gallon off, the MPG inaccuracy was 43% off.
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My daughter is in 6th grade. Her science project this year is MPG vs PSI. My CX9 GT-AWD played an important role in this. Here is the prelim result. On a stretch of 2-mile local road w/o light/stop sign. Each data point was obtained by averaging four data points (back and forth twice to counter slop and wind effect). Vehicle was maintained at target speed with cruise control. 35 40 45 50 --------------------------------------------- 40 27.3 26.4 25.4 24.7 35 26.7 26.4 24.8 24.7 30 26.4 24.8 24.5 24.7 25 25.6 24.4 23.7 23.5 20 24.3 22.8 22.8 21.4 -------------------------------------------- ^ PSI (all four tires) - warm As you can see the CX9 is well-capable of doing 27mpg provided that - run tires at 40 psi (MAX=51psi), it is a bit bumpy... - maintain speed at 35-40 whenever possible on local roads. My daughter and I spent the entire afternoon for that data. BTW, the TPMS lights came on at 20psi (not 25psi or above). It went away when I pumped them up to 35psi (my typical) and CX9 reached 15mph from start. Also, a PSI drop of 40/35 down to 20 costs you ~10% drop in MPG. The MPG was based on my ScanGaugeII, which was +7% compensated. I have calibrated it for almost 1-year at the pump. It has been very accurate now (+/- 0.05 gallon error out of 17-18 gallons)
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