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Gas mileage dropping, worried something mechanical.

Discussion in 'Ford Raptor Engine Discussion and Performance Mods' started by cddawgs, Mar 23, 2019.

  1. ogdobber

    ogdobber Full Access Member

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    Dirty air filter.... That's why it's gradual


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  2. lottp

    lottp Full Access Member

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    Tire pressure makes a difference. It was a noticeable drop in MPG when the cold winter temps caused a normal PSI reduction for a few psi (34psi to be exact). Once I pressured back up to 38, the MPG went back to normal.
     
  3. buyfire

    buyfire Full Access Member

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    I was averaging around 16 when I purchased around August. When winter really hit and got cold my mileage also took a major shit. My guess is that you'll start to see it recover when all the winter gas is used up.
     
  4. OPT PRIME

    OPT PRIME Full Access Member

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    Pull and clean both MAP sensors. Without a catch can they WILL get covered in oil and mileage will degrade over time (mine did). Also do some calculations by hand, I found the built in meter to be quite optimistic.
     
  5. solsurfr

    solsurfr Full Access Member

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    My MPG's were dropping as a result of the IWE system not fully engage out of 4WD which is a documented TSB for Ford. Probably not related to what you're experiencing but my MPG's were dropping from 15-16 to 13-14 under same driving conditions.
     

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