Impressive GT fuel economy!

Discussion in 'Mustang S550 General Forums' started by rf_ross, Jul 19, 2018.

  1. rf_ross

    rf_ross Member

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    I just returned home from a 2k mile round-trip road-trip from my home near Detroit to Steeda in Valdosta, GA in my 2018 GT. The only mods prior to leaving are a new aFe Pro-S dry replacement air filter and my lighter than stock wheels/tires. When I left the car had less than 2k miles on the odo.

    I-75 is basically flat from Detroit down through Ohio and into Kentucky and Tennessee where you start to run into some rolling hills and then it flattens out again in Georgia.

    I drove very conservatively at only 2 - 3 mph over the speed limits which were mostly 70 mph and I used cruise control the majority of the time.

    My mileage was calculated using Fuelly versus going off the cars computer which I found to be a touch optimistic.

    I left home without a full tank and my first fill-up was in Perrysburg, OH and I kept track of the trip mileage from that point on:

    1) 29.0 mg

    2) 27.9 mpg

    3) 25.6 mpg

    4) 26.3 mg

    5) 28.0 mpg

    6) 28.3 mpg

    Metro Atlanta traffic screwed me on the way down and on the way back so that's where it fell off into the 25's and 26's. But overall I'm extremely pleased with the numbers!
     
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  2. Silver Bullitt

    Silver Bullitt Well-Known Member

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    That's great. Can't ask for much better. I have also found the onboard to be a little optimistic on the first few tanks. It seems to be about 10% higher than actual.
     
  3. Ebm

    Ebm Well-Known Member

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    .

    If I had a dime for every time someone started a GT mpg thread... :lol:


    Just curious, what's your combined mileage on a daily basis?
     
  4. kz

    kz Well-Known Member

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    Drove from north of Cinci to Bristol, TN with heavily loaded car (2 people, 4 wheels, jack, tools, lots of other stuff - basically no space left, was sitting low on springs) and got 27.6mpg with 3.55 rear end. Mostly ~5mph above speed limit with some hills on the way. I thought about towing it (have F150 ecoboost with 10 speed auto) but that would make no sense at all...
     
  5. Zinc03svt

    Zinc03svt Well-Known Member

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    I’m averaging 22 in mainly city and light hwy driving. Not bad at all:
     
  6. OP
    OP
    rf_ross

    rf_ross Member

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    If I can keep my foot out of it most of the time I'm hovering around the 22 - 23 mpg area which I also think is pretty darn good. And that's probably close to a 50/50 mix of city/highway driving.
     
  7. TripleB

    TripleB Well-Known Member

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    12mpg crew and wouldn't have it any other way

    guys like OP are the ones sitting in the fast lane with cruise control set to 65... get out of my way
     
  8. STEVO 5.0

    STEVO 5.0 Well-Known Member

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    :hail:

    Around 15MPG here. If these slow pokes would move over I'd probably be able to match your 12.
     
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  9. Stormtrooper5.0

    Stormtrooper5.0 Well-Known Member

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    Wow so my 10mpg was really like 8-9 haha. True muscle car numbers:D
     
  10. Silver Bullitt

    Silver Bullitt Well-Known Member

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    20.2 and 20.4 on my first two tanks. Onboard showing 21.9 for both tanks. Break-in period is over, so I expect both to start going down.
     
  11. Ebm

    Ebm Well-Known Member

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    I agree, that is good. I average about 20-21 mpg with a 50/50 split. Between wider tires and 4.10 gears, I'm surprised it isn't worse.




    Haha, of course. In a few months, I'll ask what the lowest mpg tank you've had is :D
     
  12. Gman

    Gman Gman

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    Haha those were the days. Go Flex Fuel or E85, then you will get half that. I best 12-14 now.
     
  13. DoubleX

    DoubleX Well-Known Member

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    High MPGs is just a reminder I’m not driving hard enough

    In all seriousness, my highest was about 27 mpg, driving really conservative on cruise control.
     
  14. CompOface

    CompOface Well-Known Member

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    Thanks for saving the extra gas for the rest of us! It is impressive though, but mine stays well below 20 mpg
     
  15. Zelek

    Zelek Well-Known Member

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    Oh look, another MPG thread on a sports car forum. :frusty:
     
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  16. michail71

    michail71 Well-Known Member

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    I've been about 19 to the 20.

    Considering my last 4 cyl turbo got 26 it's not too bad.
     
  17. wanted33

    wanted33 Well-Known Member

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    Impressive Bob. BTW, Atlanta will screw one up coming, or going. I hate driving through there. Sometimes more than I hate driving through DC. :)
     
  18. Ebm

    Ebm Well-Known Member

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    Says the guy with 2 brand new cars... :p
     
  19. raydog1

    raydog1 Member

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    What the heck? I thought I was doing GREAT with my 20.5 highway/city mix. Maybe I should switch to the left one on the leg press at the gym?

    20130119-FeaturedSpeedTrap.jpg
     
  20. OP
    OP
    rf_ross

    rf_ross Member

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    au contraire! I do stay out of the left lane except to pass. In fact, on this trip, I probably spent more time in the right lane than any other.

    One of my part-time retirement jobs is driving big trucks so I'm pretty sensitive to not being a fast lane blocker...
     
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