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Thread: Signature mpg

  1. #31
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    Quote Originally Posted by Sig cx-5 View Post
    I've run both 87 and 93. I would probably need a stopwatch to tell if there's any difference from 0-60, because I didn't feel it. The main advantage of the turbo is the low end torque, which is the same no matter what octane you use. Since 93 is about 60 cents a gallon more than 87 here, and I'm not tracking the vehicle, it's kind of a no brainer for me. If the price was say, 20 cents apart, it would probably be different.

    Just to be clear, I am not criticizing you for running higher octane. If you spend enough time above 4k RPM, it's probably worth it.
    Maybe I'll feel the same after the "newness" wears off. My engine isn't even broken-in yet, so I'm not pushing things too hard. My other car is over 4K RPM a lot, but it's a manual and only develops 221 ft-lb torque (at 4400-6000 RPM). With the CX5 turbo I get that you need to really punch it to feel the extra HP, but the problem I see is you never know when you'll need/want it. Wife usually puts in low octane, so I add 93 when I fill. As I said before, it probably averages-out to near 90. I'll take the compromise between the two.

  2. #32
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    Quote Originally Posted by colden View Post
    I live in SoCal, a lot of stop and go. I*ve been using 91 Costco gas, the dash ranges from 20-23 mpg.
    That's actually not bad! I'm in SoCal too and I've typically been putting in 89 and I'm averaging 19-20 mpg. I don't stomp the gas but I'm not extremely gentle either.

  3. #33
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    Getting better. So far 3 tanks down since purchase:
    Trip Calculated Summary
    18.8 N/A Iffy gas from dealer, and having a bit too much fun
    20.3 20.56 Lots of idling w/AC, getting used to the throttle, very little hwy
    22.4 23.77!! Trip seriously underestimated, quite a bit of hwy, driving more "normal" now

  4. #34
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    Quote Originally Posted by CSEngineer View Post
    Getting better. So far 3 tanks down since purchase:
    Trip Calculated Summary
    18.8 N/A Iffy gas from dealer, and having a bit too much fun
    20.3 20.56 Lots of idling w/AC, getting used to the throttle, very little hwy
    22.4 23.77!! Trip seriously underestimated, quite a bit of hwy, driving more "normal" now
    I have a GT-Reserve, and keep track of my mileage in a spreadsheet.

    On average, I get 22.8 MPG using 87 octane, and 24.4 MPG using 93 (based on 3 tanks of each). Given that I have switched up from one tank to the next, I think the "undiluted difference" might be greater.

    Regarding my spreadsheet, I calculate each tank's MPG manually, and also enter what the computer says. I then take those two figures and calculated how many cups of gas more/less I should have bought for the two MPG figures to match.

    I found that while the two MPG figures do not always match on a tank-by-tank basis, they equal each other over time (after about 2,000 miles and 6 tanks of gas, they are within .08 mpg of each other). My biggest spread on an individual tank has been 1.6 MPG.

    On an individual fillup basis, I once calculated that I would have had to purchase an extra 3.93 cups of gas in order for the two MPG figures to match. Then the next tank, I would have had to purchase 3.91 cups less for them to match.
    The back-to-back swings have been as high as 11.52 cups more then 12.72 cups less.
    The middle variance was 6.00 cups more/6.13 cups less.

    So the individual tank MPG calc difference all depends on how full that tank was to start, and how full I got it at that fill up. Not all gas station lots are level. And I may have not been as patient each fill up.
    Last edited by Avoidin Deer; 06-17-2019 at 08:16 PM.

  5. #35
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    Quote Originally Posted by Avoidin Deer View Post
    I have a GT-Reserve, and keep track of my mileage in a spreadsheet.

    On average, I get 22.8 MPG using 87 octane, and 24.4 MPG using 93 (based on 3 tanks of each). Given that I have switched up from one tank to the next, I think the "undiluted difference" might be greater.

    Regarding my spreadsheet, I calculate each tank's MPG manually, and also enter what the computer says. I then take those two figures and calculated how many cups of gas more/less I should have bought for the two MPG figures to match.

    I found that while the two MPG figures do not always match on a tank-by-tank basis, they equal each other over time (after about 2,000 miles and 6 tanks of gas, they are within .08 mpg of each other). My biggest spread on an individual tank has been 1.6 MPG.

    On an individual fillup basis, I once calculated that I would have had to purchase an extra 3.93 cups of gas in order for the two MPG figures to match. Then the next tank, I would have had to purchase 3.91 cups less for them to match.
    The back-to-back swings have been as high as 11.52 cups more then 12.72 cups less.
    The middle variance was 6.00 cups more/6.13 cups less.

    So the individual tank MPG calc difference all depends on how full that tank was to start, and how full I got it at that fill up. Not all gas station lots are level. And I may have not been as patient each fill up.
    Wow and I thought I was ocd, lol. Just use the car fuel economy readings, life is short.

  6. #36
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    Quote Originally Posted by JT2 View Post
    Wow and I thought I was ocd, lol. Just use the car fuel economy readings, life is short.
    Once the spreadsheet has been set up, I only have to put that tank's data into it (#gals/miles driven/computer mpg).

    I might stop after a while...I'm still in New Owner mode. I usually track stuff when I first get a car, and then treat it like any other familiar relationship And I now know that my computer's MPG calcs are accurate.

    Don't ask how I have my shopping lists set up...

  7. #37
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    That*s good to hear that your findings confirm the computer mpg readings. Thanks for your info and saving me some time.
    I once knew a guy that put dates on his socks to track how long they lasted
    Last edited by JT2; 06-17-2019 at 09:04 PM.

  8. #38
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    Quote Originally Posted by JT2 View Post
    That*s good to hear that your findings confirm the computer mpg readings. Thanks for your info and saving me some time.
    I once knew a guy that put dates on his socks to track how long they lasted
    I'm sitting here laughing at your friend's socks. That's pretty funny.

    If he was tracking the differences in price/quality, and used a Pedometer to chart out the Pennies-Per-Step, then it kinda makes sense to me.

    The things we do to give ourselves the illusion of control...

  9. #39
    Structural Member shadonoz's Avatar
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    Quote Originally Posted by JT2 View Post
    Wow and I thought I was ocd, lol. Just use the car fuel economy readings, life is short.
    Some people just enjoy statistical analysis.

    And some people are retired, and altho their life is even shorter now, they have time to do what they enjoy.

  10. #40
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    Quote Originally Posted by shadonoz View Post
    Some people just enjoy statistical analysis.

    And some people are retired, and altho their life is even shorter now, they have time to do what they enjoy.
    I spent the second half of my career doing data analysis, after 20 years of purchasing, contracts & inventory management. People used to give me grief for doing so much in spreadsheets...but they knew who to come to for data analysis help. I've given classes in this stuff (and still do as a community volunteer).

    This started just as a place for me to log my mileage, and once I accumulated some data it "just expanded." It always does, somehow.

    I can enter the current price of a gallon of 87 and 93, and it will give me the spread of a representative 300 Mile Tank of gas based upon each octane's inception-to-date average mileage. (At today's prices, the upcharge for a 300 Mile Tank of 93 octane is $5.61).

  11. #41
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    Here's my mileage for my Signature's first 2700mi:



    It's actually averaging better MPG than my old 2014 CX-5 2.5L:



    Not much winter driving in the new one though, which drastically lowers MPG.

  12. #42
    Registered Member PatrickGSR94's Avatar

    2014 Mazda CX-5 Touring

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    Type of driving makes a huge difference. When school is in, my wife sits in the pick-up line, engine idling, for as much as an HOUR each day. MPG for each tank usually comes in around 23.5 to 24 ('14 Touring 2.5L). But during summer or Christmas breaks with no school pick-up idling, the average is more like 27.5 to 28.5 MPG which is all in-town driving (no highway). And on road trips we've had it up over 30 on several occasions.
    1994 Acura Integra GSR - 368K miles, a few mods
    2014 Mazda CX-5 Touring - 88K miles, the family hauler!

  13. #43
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    GTR owner, but averaging about 25-26 miles for 4 fill ups/1000 miles.

    Really depends on how I drive. If I cruise along on highway speed limits I've had it up to 32 mpg for mainly highway trips (per computer). 15 mpg for stop and go or short trips (again per computer). Also tested out my turbo fun on the "32 mpg route" and averaged about 22.

    Since I came from an economy class vehicle, I've been mainly driving gently for both engine break in and money saving. Have only filled with 87 thus far (10% ethanol. No choice for less regardless of fuel grade)

  14. #44
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    IMG_1693.png

    ~40 mile commute, mixed freeway, congested freeway, city streets (with well synchronized lights), adaptive cruise used when possible. Premium fuel.
    Last edited by scottj; 06-23-2019 at 12:24 PM.

  15. #45
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    Quote Originally Posted by scottj View Post
    IMG_1693.png

    ~40 mile commute, mixed freeway, congested freeway, city streets (with well synchronized lights), adaptive cruise used when possible. Premium fuel.
    I need to find a way to filter out comments where members are getting 30% better mileage than I am.

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