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Thread: What Gas Mileage are you getting with Cylinder Deactivation?

  1. #1
    Structural Member shadonoz's Avatar
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    Question What Gas Mileage are you getting with Cylinder Deactivation?

    Seeing report of mid 30s here and there. Never see that on my 17. Wondering if CD helps more than advertised.

    Please include year, AWD vs FWD, total mileage, where you drive, how you drive, computer or manually computed, and anything else that might be relevant.

  2. #2
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    19 touring awd w/5k miles mostly rural, some city some freeway

    Best tank so far - 29.7
    Worst tank - about 26
    Best trip (highway with active cruise) - 35.3
    Worst trip around town - about 20 mpg

    Total average since purchase 27.7

    All as per trip computer, but I did hand calculate a few tanks and they always were within 0.3 mpg (sometimes higher sometimes lower)

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    I commute on highway every day. I get around 32-35 without traffic (using trip computer). 19 GT AWD 3500 mileage. On downhill, I push acceleration little more on the top and let it coast itself.

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    2018 Mazda CX-5 GT AWD w/Prem

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    2018 GT w/PP AWD. 24k miles total, Central Indiana (pretty flat), commute is about 50% 40-50 mph, and 50% freeway at 65-70 mph.

    According to Fuelly, over 75 fill-ups I'm averaging 28.6 mpg with a high of 32.3 mpg.

    For my commute (according to the trip computer that comes on when I turn the car off) I routinely see mpg > 30 and have seen it hit 34.5 mpg.

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    Fiances 2018 Touring AWD hits consistent 29-32 mpg with her mostly highway commute.

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    I have the 2018 CX5 GT AWD with 4,900 km. I am getting 8.5 litres per 100 km (27.6 miles/US gallon). This is with a mix of city (30%) and highway driving (70%).

    Wade

  7. #7
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    2018 Cx5 AWD with CD--->get 24-25 around town and 35-36 on long 600 mile interstate trips. The average for the last 7600 miles is showing 29.8 MPG

  8. #8
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    Quote Originally Posted by shadonoz View Post
    Seeing report of mid 30s here and there. Never see that on my 17. Wondering if CD helps more than advertised.

    Please include year, AWD vs FWD, total mileage, where you drive, how you drive, computer or manually computed, and anything else that might be relevant.
    What are you getting with your 17??

  9. #9
    Structural Member shadonoz's Avatar
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    I don't track mine carefully, so it's hard to say. And I'm atypical because I have low miles, do a lot of short trips, and live up a hill.
    Estimating
    city 18-22
    mixed 25-27
    highway 27-30
    It varies a lot. I saw 33 on the highway once, but that's slightly downhill and I got 27 on the way back. That was cruise set to 74, no AC.

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    Noone asked, but this is nearly 600 miles in on my SW Missouri to San Antonio trip today in my GT-R.


  11. #11
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    Quote Originally Posted by shadonoz View Post
    I don't track mine carefully, so it's hard to say. And I'm atypical because I have low miles, do a lot of short trips, and live up a hill.
    Estimating
    city 18-22
    mixed 25-27
    highway 27-30
    It varies a lot. I saw 33 on the highway once, but that's slightly downhill and I got 27 on the way back. That was cruise set to 74, no AC.


    so maybe a few miles more MPG with CD....

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    Keep in mind CD isn't even on at highway speeds of 65mph+.

    We have taken our 2018 CX5 on some long backroads with constant speeds in the 40-50mph range and I've seen the average in the mid to upper 30's in those stretches

    Taking a trip to South Carolina next week so I'll keep an eye on it, in May when we took the same trip the highway average was 32 for over 1800 miles....I set Trip B to be a grand total and use Trip A for each tank of gas.

  13. #13
    Gen-1 Kodo Design 👌 ColoradoDriver's Avatar
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    Quote Originally Posted by velocityc6 View Post
    Keep in mind CD isn't even on at highway speeds of 65mph+.
    Yeah, I was going to say CD only operates at sustained speeds between 25-50 MPH (I think it's up to 50?).

    These highway speeds, CD is off. If you're not sustained between 25-50, CD is off.

    I think you guys are reading too much into CD.
    2014 CX-5 Touring AWD 2.5L | Jet Black Mica - 84k miles
    01/2013 build | 4/20/2013 delivery

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    Quote Originally Posted by ColoradoDriver View Post
    Yeah, I was going to say CD only operates at sustained speeds between 25-50 MPH (I think it's up to 50?).

    These highway speeds, CD is off. If you're not sustained between 25-50, CD is off.

    I think you guys are reading too much into CD.
    Yup, its useful if doing alot of 35-50 mph driving (sustained flatish backroads)....hills which require more throttle, higher speeds such as highway, all will mean CD isnt even a factor.

    I'd venture to guess even a NON CD 2017 would be getting excellent fuel economy at such speeds (35-55) with little throttle.

  15. #15
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    2019 Cx-5 sport

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    550 miles on vehicle, 80% city driving.......... average mpg 25.4 right now...
    according to mazda software

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