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Highway Fuel Economy worse than City?

Discussion in 'Stock 2011 - 2019 Ford Explorer Discussion' started by metroplex, March 2, 2018.

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    1. jo7hs2

      jo7hs2 Active Member

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      Just to chime in about the original post... With my 2018 XLT AWD, I’ve been getting consistent 22MPG highway. If I never set tires off the highway, I can maybe push that up to 23-24MPG. That’s at usual cruising speeds, not 55. Mixed rural driving works out to more like 19-20MPG. Haven’t done any city driving yet, as I don’t do much.

      However... fuel economy was HORRIBLE the first two tanks of gas. Calculated, not just on the screen. The cyclone needed a little time to loosen up, clearly. Never had a vehicle get such horrible fuel economy during break in. It resolved about 250 miles in.

      Also... I have noticed that, unlike my previous Ford vehicles, running the defrost (which engages the AC compressor) results in a significant drop in fuel economy. 1-2MPG on the highway. Usually, the difference was not noticeable on the highway beyond a very slight reduction in power, whereas it was noticeable in city traffic. I’m wondering if they used a very large compressor due to the extra passenger vents.

      Additionally, as others have noted about temperature, and just like our Ecoboost Escape, we’ve noticed a significant drop in fuel economy when it is very cold, say below 20F. Interestingly, all my previous naturally aspirated Ford’s did not display this behavior, but the newer boosted Escape does. Clearly not a Ecoboost related matter, as our Explorer is naturally aspirated.
       
      Last edited: March 8, 2018
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    3. peterk9

      peterk9 Staff Member Moderator Elite Explorer

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      Had a chance to check mine yesterday as I don't get out on the highway that often. At 72 MPH the tach was almost but not quite up to 2000 RPM.

      Peter
       
    4. Odrapnew

      Odrapnew Active Member

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      It just might be that your average freeway speeds are much higher than the EPA testing, therefore you don't see the typical highway MPG bump.
      Remember, drag force increases with the square of your speed. There's about 30% more drag force @ 80mph vs. 70mph.

      I don't think you can compare the naturally aspirated 3.5 V6 to the Twin Turbo Ecoboost 3.5 V6 for highway rpm The Ecoboost makes good torque at low rpm, so it doesn't need to run at the higher RPM to be more in the powerband . I'm sure the n/a V6 has a higher highway rpm to get it closer to peak torque. Peter confirmed that the Ecoboost runs about where mine runs @ highway speeds, which is more in line with the SHO.
       
    5. jo7hs2

      jo7hs2 Active Member

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      My 2018 XLT (3.5NA, 4WD, 6F55) does ~1600RPM @ 55MPH ~2000 @ 65, ~2100 @ 70, and ~2200-2300 @ 75.
       
    6. Odrapnew

      Odrapnew Active Member

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      I wanted to comment on this as well. I notice the same thing. Same gas(same tank), same driving cycle. Once temp gets near and above 40F, mileage "skyrockets." By that I mean it's about 2mpg better. Doesn't sound like much, but that's more than 10% increase.

      Sure, oil and fluids take longer to heat up when it's cold, but once up to operating temperature, the mileage should be similar.

      I guess I've never noticed that in other vehicles I've owned, but I didn't track them as closely as my Sport.
       

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