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Mileage drop over time

Discussion in 'Engine & Performance' started by Grad12, Jan 15, 2020 at 8:10 AM.

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  1. Grad12

    Grad12 Senior Member

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    Ok, I'm willing to admit, I just have no idea what's going on and I'm willing to admit I may be a victim of snake oil. My mpgs have been steadily decreasing for about 30 000 kms. Here's what I've done to my 2014 3.6 (it's got 120 000 km)

    New sparkies 5000km ago.
    K and N drop in filter (used and cleaned for 115000km)
    Throttle body spacer (used for 100000km)
    Moved cities (driving is the same but have been driving that for 10000km)
    I use RP oil and change every 6000km


    I'm getting an average now of 19 mpg, I used to get 24+ all the time. What gives? Are my cats slowly clogging? Should I try removing the throttle spacer? Add a cold air? I'm wondering if more smog creates worst mpg and how to combat that. I need that mpg back.

    Any ideas or experiences are appreciated.
     
  2. Grad12

    Grad12 Senior Member

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    I also just changed my rear dif fluid. It was changed at the dealer with RP and it was only done 5000km ago.
     
  3. jmd4100

    jmd4100 Member

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    If you have a 1500 getting 24+ mpg you must be driving like a 96 year old woman lol. I have a friend with the pentastar and he gets 16 city 18 highway. Could very well be that your cats are clogging up. Drive that thing like you stole it for a while. Pick up a couple Chevron Techron fuel cleaners and pour both in when filling your tank. I usually use 3x what the bottle says. Had to do the same with my HEMI. I used to get 22 on the highway 14 city and that dropped to 15 highway and 11 city. I drove it like I stole it on a long road trip 3/4 throttle and full throttle for a good portion. You go through gas like crazy but I'm right back at 22 highway (it's actually still 21 but close enough) and I can still get 14 in the city.

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  4. Hemi395

    Hemi395 Senior Member

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    Did you change elevation when you moved? That could contribute to the mileage difference....
     
  5. 68PowerWagon

    68PowerWagon Senior Member

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    Oh come on he has to get better than that with the 3.6?! Does he drive it in 3rd gear the whole time? :confused: My 2500 with the 6.4 gets 16 highway & about 13-14 city in the summer. With the winter blend I get 12-13 city & about 14 highway.
     
  6. jmd4100

    jmd4100 Member

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    No that's what he gets. He does drive like a you-know-what and uses 87 which I believe is correct for that engine. I use 89 in my 5.7 hemi. I'm getting 16-17 highway here on long island in the winter. I didnt know the 6.4 was that good on gas... she has a 2019 classic 3.6 red quad cab 4x4 idk what rear end he has. I have an 07 5.7 with the 545rfe (5 speed auto) and I wish the highway was better. My dad had a 19 redesign 1500 big horn 5.7 and he was getting 25 on the highway going from long island to the city. Only a dream for my truck. I can get 22 downhill coming down from upstate NY cruise set at 60-65.

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  7. 88ROOK

    88ROOK Senior Member

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    just get yourself a vararam and tuck in as close as you can and draft off a semi and you'll right back 24mpg no problem...well thats what i read from another member on here with a 5.7
     
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  8. tap4154

    tap4154 Senior Member

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    My 2018 V6 1500 gets about 19 MPG average combined, I can't imagine getting 24 combined. If I take a freeway-only trip it gets about 23-24.
     
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  9. jmd4100

    jmd4100 Member

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    Yes I went upstate with my friend in front of me carrying an 11k lbs trailer. I stayed about 30 feet or so behind and averaged 26 in my 07 5.7 5 speed

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  10. 88ROOK

    88ROOK Senior Member

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    LOL
     

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