1. Welcome to For Trucks Only !

    We are a community of American Brand Pickup Truck and SUV owners. Join now! Its Free!

    Dismiss Notice

Wow Mileage

Discussion in 'Chevy Silverado / GMC Sierra' started by ONLYTONY, Apr 1, 2018.

  1. ONLYTONY

    ONLYTONYMember

    Messages:
    19
    Likes Received:
    8
    Joined:
    Aug 18, 2015
    Location:
    East Hartford CT
    I have a 2004, 3500. 6.0, 4 X 4, with 26K. I do mileage every time I fill up. Average 10-11.5 mpg. I've been going to the same gas station, and 2 times ago I noticed more power. Got it down 1/2 tank, filled it and got 15.7. Got it down to 3/4 tank, took 8 gal, and again 15.7. I'm stumped, but very happy. Does something change around 26K miles. I'm thinking they forgot to add the 10% ethel.
     
  2. 65 sporty

    65 sportyWell-Known Member

    Messages:
    1,589
    Likes Received:
    877
    Joined:
    Aug 8, 2015
    Location:
    Marlette, Mi
    I have never heard of a 6.0 getting mileage like that, the 10-11.5 is the norm. I agree with the no ethanol theory. No, nothing changes at or around 26K
     
    • Like Like x 1
    • 7mopar

      7moparWell-Known Member

      Messages:
      1,791
      Likes Received:
      870
      Joined:
      Dec 21, 2013
      Location:
      Kingsville, MO
      Try a different pump next time you put gas in.
       
      • Agree Agree x 1
      • ONLYTONY

        ONLYTONYMember

        Messages:
        19
        Likes Received:
        8
        Joined:
        Aug 18, 2015
        Location:
        East Hartford CT
        I'm going to try the same pump one more time, 3 times means it's not luck. I use the trip mileage, but I'm going to use both trip, and full. I changed all the motors in the dash, (speed, tach, gas, heat, etc, but that shouldn't affect the odometer. True or not, getting 15.7 puts a smile on my face. Best I ever got was 14.4 going from PA to CT, must be downhill.
         
        • Like Like x 1
        • ONLYTONY

          ONLYTONYMember

          Messages:
          19
          Likes Received:
          8
          Joined:
          Aug 18, 2015
          Location:
          East Hartford CT
          Well I finally got it down to 1/2 tank. Funny, it took 15.7 gallons. Tells me the gage is ok. Mileage back down to 11.7. Double checked all the #'s, and I guess the mileage gods smiled on me for a short time.
           
        • 65 sporty

          65 sportyWell-Known Member

          Messages:
          1,589
          Likes Received:
          877
          Joined:
          Aug 8, 2015
          Location:
          Marlette, Mi
          Getting gas from the same place?
           
        • ONLYTONY

          ONLYTONYMember

          Messages:
          19
          Likes Received:
          8
          Joined:
          Aug 18, 2015
          Location:
          East Hartford CT
          I got this batch at the same place, Citgo. The new stuff is from a Mobil. I use mid range, and a few time 93, habit pushing 93 button, for my other cars. Never had any change in mpg till now at the Citgo. Next fill will be there.
           
          Last edited: Apr 25, 2018
        • 7mopar

          7moparWell-Known Member

          Messages:
          1,791
          Likes Received:
          870
          Joined:
          Dec 21, 2013
          Location:
          Kingsville, MO
          Does the cost justify a few miles per gallon? If that is what's causing it.
           
        • ONLYTONY

          ONLYTONYMember

          Messages:
          19
          Likes Received:
          8
          Joined:
          Aug 18, 2015
          Location:
          East Hartford CT
          The cost factor between reg, and mid range, is minor. I go to another town, 10 min ride, and gas is 20 cents a gal cheaper than the town I live in. I use mid grade, I figure it can't hurt. Here in CT the temp can change 20 to 60 degrees in a day, so every 2nd fill I add 4 oz of sea foam to help moisture not form, truck is parked outside. 14 years old, 26K miles, orginal spark plugs, and runs like new. My other 3 cars, Lincoln Mark VIII's use 93, and that hurts the wallet, but they get around 20 mpg. Like sporty said, 10-11 mpg is average for this truck. This 15.7 mpg is a fluke. Hope it happens more often
           
          • Like Like x 1
          • LocuMob

            LocuMobFluid Technician

            Messages:
            3,421
            Likes Received:
            2,007
            Joined:
            Mar 20, 2015
            Location:
            Blue Earth, Mn
            My '94 Ram 2500 with a 360 with mild cam and shorty headers, built transmission and 3:91's got 15, and I was happy. My '98 2500 with everything stock (360/auto) and 4:10's gets 10-11, which is fine, but sucks at the same time.
             
            • Like Like x 1
            • 7mopar

              7moparWell-Known Member

              Messages:
              1,791
              Likes Received:
              870
              Joined:
              Dec 21, 2013
              Location:
              Kingsville, MO
              To get 10 with the D350 it would require rolling down hill with the wind.
               
              • Like Like x 2
              • Polara_500

                Polara_500Well-Known Member

                Messages:
                646
                Likes Received:
                400
                Joined:
                Aug 9, 2015
                Location:
                NW Minnesota
                Engine running or not??;)
                 
                • Like Like x 1
                • 7mopar

                  7moparWell-Known Member

                  Messages:
                  1,791
                  Likes Received:
                  870
                  Joined:
                  Dec 21, 2013
                  Location:
                  Kingsville, MO
                  Not real sure how fast the wind will move it. 35 mph has been the fastest I have allowed. Engine not running and in neutral on level ground.
                   
                1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
                  By continuing to use this site, you are consenting to our use of cookies.
                  Dismiss Notice