27mpg on a 2004 Auto GT

Discussion in 'SN95 4.6 Talk' started by Notchbck93, Jul 6, 2008.

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  1. 40th GT New Member

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    There's gotta be something wrong..
    40th GT, Jul 28, 2008
    #21

  2. justinschmidt1 Member

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    usually 5 speed guys are getting like 24-26 mpg on the highway...us auto guys seem to get like 20-22 at best

    but 26 is great
    justinschmidt1, Jul 28, 2008
    #22

  3. COramprat Old guys rule!!!

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    I've completed the second week of 65MPH driving. My work drive is 150 miles a day. I was able to get 24.69 MPG with my mods below. The second week dropped a bit, 22.98, since I have an issue with a sensor, triggering the CEL, and it started running rich.

    Before, I would travel at 78MPH to work and averaged 19-20MPG. I slowed to 70 and got 22-23. Slowing to 65 has added about 1.5 mpg...probably about the limit...but over all I've added nearly 5mpg slowing form 78 to 65. Gives me an extra trip to work every two weeks and saves me 100 bucks.
    COramprat, Jul 28, 2008
    #23

  4. Crzyhrse Active Member

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    I managed 27mpg going 78mph with my stock 3.55's. Minimal mods: CAI, Catback, Midpipe, Tune. I've got a 5 speed.
    Crzyhrse, Jul 28, 2008
    #24

  5. theseeker411 New Member

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    I averaged about 26 mpg on the highway at 75 mph.
    theseeker411, Jul 28, 2008
    #25

  6. streethorse Active Member

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    A huge part of getting great highway mpg's is wind resistance.
    If you have a strong tailwind you can fly, whereas a crosswind or headwind
    can ruin your numbers.
    streethorse, Jul 28, 2008
    #26

  7. Notchbck93 New Member

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    With construction on the highway, I've been doing a fair amount of stop'n go which has brought me down to 23.17 mpg on the last fill up. This includes running the AC.
    Notchbck93, Jul 28, 2008
    #27
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