Hypermiling the 3.5.

Discussion in '3rd Gen - 2007 - 2017' started by Muddy Bean, Feb 11, 2018.

  1. Muddy Bean

    Muddy Bean Full Access Members

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    Ok, someone run her until empty :) I’d be tempted...but would
    Have to carry a 5 gal can around


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  2. JExpedition07

    JExpedition07 Elite Member Supporting Member

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    Not worth it, these modern fuel pumps hate that and sucking in air can kill them. It’s a good idea to fill when you get down to 1/4 tank IMO.
     
  3. mossback

    mossback 2017 Limited EL

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    Prior to the Expy, when I had Tahoes & Suburbans, the rule was to keep fuel above 1/4 tank if at all possible, especially in the summer.
     
  4. deweysmith

    deweysmith Full Access Members

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    33.5, I stand corrected!

    Though that makes me even more frustrated… why was it running out of gas with at least half a gallon left in the tank?!
     
  5. Muddy Bean

    Muddy Bean Full Access Members

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    Sloshing? Fuel sloshes away from pickup tube and then you get air? That’s only a guess not knowing how the tank and pickup tube is designed.


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  6. sjwelds

    sjwelds Full Access Members

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    Yep. My brother-in-law has an 02 or so Tahoe. Last year his wife was on her way here - they live about 3 hr away from the rest of us - and ran it out of gas. Even after a trooper helped her get some gas, it still wouldn't run. After work, I ran up and got it. Took a hammer along and tapped on the bottom of the fuel tank, and it fired right up and I drove it onto my trailer. Actually ran fine for a week or two, but they ended up having to replace the fuel pump.
     
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  7. chuck s

    chuck s Full Access Members

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    At what miles-to-empty does the '17 Expedition light the low fuel light? It was at 50 in my '07. 23 gallons is my normal fill when at this point on both trucks. Never ran either completely dry.

    Driving conservatively did not increase my travel time on multiple trips from Cleveland to Gettysburg when my daughter went to college there. Running ~65 mph the '07 could get there non-stop and still have a fuel cushion. Running ~75+ required a fuel stop that ended up adding enough time to the trip that it was equal to the more conservative speed. And burned more fuel.

    But "I can't drive 65." (Apologies to Sammy Hagar.)

    -- Chuck
     
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  8. jeff kushner

    jeff kushner Full Access Members

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    Mine still is running 17.9 accrued mileage since new.....each tank runs around 18-18.2.

    My recent concern for oxygenated fuel may have been an over-exuberant right foot....as my mileage has returned.....?!?

    I just don't have the patience to hyper it.....too nerve wracking for me.

    jeff
     
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  9. J Ski

    J Ski 3.5plati

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    I try to drive conservatively due to having larger tires, a lift, and an intake system installed. I keep it between 14-17 city and 17-19 highway which isn’t terrible. Economy and either performance or perf/tow tunes from 5star are next on my list
     
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  10. Muddy Bean

    Muddy Bean Full Access Members

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    I’m really wanting a Livernois tune but I’m concerned about the MPG hit. Obviously the extra power will encourage me to utilize it more often but on those trips when budget matters and I’m driving like grandad, will a tune be rough on my MPG?


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