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Is it normal for MPG to greatly decrease after 70+ mph

Discussion in '3rd Gen. Tacomas (2016+)' started by taco_newb, Jan 11, 2018.

  1. Jan 11, 2018 at 6:55 PM
    #1
    taco_newb

    taco_newb [OP] Well-Known Member

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    If I drive 60-70 mph, I get 18-19 mpg. But when I drive over 70 mph, I get 15 mpg. Is that normal?

    Truck is totally stock. I was expecting 20-23 at highway speeds but I never get near that. I use cruise control.
     
    Lucifer1 likes this.
  2. Jan 11, 2018 at 6:56 PM
    #2
    gthupman

    gthupman Well-Known Member

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    Yes
    Over 2000 rpm is no bueno
     
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  3. Jan 11, 2018 at 6:58 PM
    #3
    RelentlessFab

    RelentlessFab Eric @Relentless Fab Vendor

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    Aerodynamics come into play big time over 55-60mph in trucks/suvs. The faster you drive a truck (basically a brick moving through the air) the harder it is and more work the engine is going to have to do. This is even more true with a lifted truck since it has more surface area so keep that in mind. Gotta pay to play
     
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  4. Jan 11, 2018 at 7:00 PM
    #4
    Exracer2

    Exracer2 Well-Known Member

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    Wind resistance is exponential. As you go faster the resistance keeps getting higher at a higher and higher rate.

    More resistance = less mpg.
     
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  5. Jan 11, 2018 at 7:07 PM
    #5
    Clearwater Bill

    Clearwater Bill Sometimes when I close my eyes, I can't see.

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    Where are you that highway speeds are over 70?

    They exist, just not in a lot of places
     
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  6. Jan 11, 2018 at 7:09 PM
    #6
    SearArtist

    SearArtist Player Hater #001

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    Any interstate around here people are usually rolling at 75-80mph regardless of the posted speed limit.

    I drive 80mi a day mostly interstate and average 18-19mpg with varied speeds of 70-75mph.

    Edit- OP, try not using cruise, I’ve found I get far worse mpg with it on.
     
  7. Jan 11, 2018 at 7:10 PM
    #7
    SoCOTaco

    SoCOTaco Well-Known Moron

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    In a word, yes. Higher RPM's, more wind resistance, etc play in. That's exactly why I stick to 70.
     
  8. Jan 11, 2018 at 7:10 PM
    #8
    RelentlessFab

    RelentlessFab Eric @Relentless Fab Vendor

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    Plenty of the Southwest has 70+ speed limits. We've got 70 and 75mph speed limits within 10 minutes of Reno on 2 different freeways for instance and quite a few in Cali and AZ too.
    As soon as we hit Utah on I80 it bumps all the way up to 80mph. Gets sketchy when towing a rig on a car trailer with most trailer tires rated at 75mph or less and semi trucks are blowing by in the left lane at 85+ mph.
     
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  9. Jan 11, 2018 at 7:10 PM
    #9
    Skydvrr

    Skydvrr IG: @kalopsianick

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    U don't do over the speed limit in a 65?
     
  10. Jan 11, 2018 at 7:16 PM
    #10
    melikeymy beer

    melikeymy beer Hold my beer and watch this

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    Most of the interstates in OK outside the urban areas are 75 posted. People roll at 80 to 85 routinely. And yes the mpg sucks on these trucks 65+.
     
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  11. Jan 11, 2018 at 7:22 PM
    #11
    iimig

    iimig Member

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    We recently moved to Montana and practically the whole interstate system is 80. Although I can go that fast if really needed, for all intents and purposes I literally cannot do the speed limit. Seems like a huge mistake to have all this truck and be prevented from doing one of a vehicles most basic tasks.
     
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  12. Jan 11, 2018 at 7:22 PM
    #12
    melikeymy beer

    melikeymy beer Hold my beer and watch this

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    There are lots of threads about mpg on these trucks. For a stock Tacoma the mpg you are getting is not normal imo. Have you made modifications? Lift or more aggressive tires?
     
  13. Jan 11, 2018 at 7:25 PM
    #13
    melikeymy beer

    melikeymy beer Hold my beer and watch this

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    If I did over 20% of my driving at interstate speeds I would drive something else.
     
  14. Jan 11, 2018 at 7:27 PM
    #14
    hiPSI

    hiPSI Laminar Flow

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  15. Jan 11, 2018 at 7:28 PM
    #15
    CaptainBart45

    CaptainBart45 Well-Known Member

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    Yep, higher speeds take more fuel, Nascar and Truckers know this well.
     
  16. Jan 11, 2018 at 7:29 PM
    #16
    rpkean

    rpkean Well-Known Member

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    Auto or manual? I have the 6 speed and best I got was 20mpg doing about 65-70 the full tank.

    Edit: I have a 2nd gen, just realize this was for the 3rd...
     
  17. Jan 11, 2018 at 7:33 PM
    #17
    melikeymy beer

    melikeymy beer Hold my beer and watch this

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    The sweet spot on my Lexus ES350 is about 70 at 29 mpg. At 80 it drops to about 28mpg so ok....
     
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  18. Jan 11, 2018 at 7:33 PM
    #18
    17taco4x4

    17taco4x4 Death Star

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    Mostly West Texas, Interstate 10 has some parts with a speed limit of 80 MPH.
     
  19. Jan 11, 2018 at 7:33 PM
    #19
    black coffee

    black coffee A is A.

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  20. Jan 11, 2018 at 7:35 PM
    #20
    Jimmyboyblue

    Jimmyboyblue Well-Known Member

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    Over 80 with the AC and 3,500 rpm will kill MPG
     

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