Switched to 5w-20 Mobil 1 and now my mileage has dropped? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 19 (permalink) Old 11-26-2011, 10:53 AM Thread Starter
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Switched to 5w-20 Mobil 1 and now my mileage has dropped?

WTF! I changed my oil yesterday. I normally run Castrol GTX 5w-20, 2009 Hemi, 19,000 miles

I decided to try synthetic so I went with Mobil 1 5w-20 and a WIX filter.

I drove a 300 mile round trip yesterday evening that I have done many times before and I always average around 17.5mpg for the entire 300 miles. This trip was different, i barely got 16mpg

I ran the cruise set on speed limit for the whole trip like I always do, there was no wind, very little traffic. 70mph on the highway, 55mph on the back roads, only one town to drive through. Conditions were about the same as always. Fifty degree sunny mountain weather!

I would have thought that the syn would have at least netted me the same mileage if not better.

I was told by my dealer that the MDS/VVT likes the syn better and will hold in 4cyl mode slightly longer with it.

I'm going to try the syn for one more change and if I continue to see the mpg drop I'm going back to dino oil.

Anybody else have this issue?
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post #2 of 19 (permalink) Old 11-26-2011, 04:29 PM
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I don't have an answer to your question but I have a question of my own: How the heck were you getting 17.5 mpg with a HEMI???


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post #3 of 19 (permalink) Old 11-26-2011, 04:36 PM
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Where was the moon? The gravitational pull of the moon will effect your gas mileage with a vehicle as heavy as the xk!
JK, but it could be tire pressure, your air filter, any number of things... I wouldn't worry about it much, check the obvious things and if it doesn't get better then dig deeper.
I didn't notice a drop when I switched. I'm sure someone here may have some good ideas.
Keep us posted!

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post #4 of 19 (permalink) Old 11-26-2011, 04:39 PM
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Before lifting and bigger tires I could get that if most of my trip was on a 55MPH two lane. Maybe I still could if I really tried...

Black 2006 Limited 5.7
Rocky Road 2.25" Lift,
Spidertrax 1.5" Wheel Spacers,
265/70R17 Bridgestone Dueler A/T RH-S
Gibson 3" SS Exhaust
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post #5 of 19 (permalink) Old 11-26-2011, 06:58 PM Thread Starter
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Quote:
Originally Posted by JJSEBASTIAN View Post
Where was the moon? The gravitational pull of the moon will effect your gas mileage with a vehicle as heavy as the xk!
JK, but it could be tire pressure, your air filter, any number of things... I wouldn't worry about it much, check the obvious things and if it doesn't get better then dig deeper.
I didn't notice a drop when I switched. I'm sure someone here may have some good ideas.
Keep us posted!
I checked tire pressure before I left, 36 in all 4. The air filter is new as of two weeks ago, its a WIX.

I did rotate the tires while I had it in my garage but that is it.

I normally get 19 on constant highway runs but this trip(one that I do often) is a mix of interstate in the mountains(I-81S to I-77N) which crosses the eastern continental divide then west on 52(byway) into the coal fields of VA.

I'm still puzzled by the result
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post #6 of 19 (permalink) Old 11-26-2011, 07:07 PM Thread Starter
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Quote:
Originally Posted by JJSEBASTIAN View Post
Before lifting and bigger tires I could get that if most of my trip was on a 55MPH two lane. Maybe I still could if I really tried...

I was getting ready to lift mine but I'm talking myself out of it for a couple of reasons. One is gas mileage and two is for resale value if I ever decide to sell it.
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post #7 of 19 (permalink) Old 11-26-2011, 09:20 PM
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New synthetic oil may be cleaning out the stuff from the old type oil. Oil number 2 should bring it back up. Also change it at regular interval for the first 2 or 3 oil changes before going longer


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post #8 of 19 (permalink) Old 11-26-2011, 10:42 PM Thread Starter
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New synthetic oil may be cleaning out the stuff from the old type oil. Oil number 2 should bring it back up. Also change it at regular interval for the first 2 or 3 oil changes before going longer


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Yep i plan on that but still doesnt explain the mileage drop. I only have 18k on it and I've always changed out at 3k so it shouldn't be too dirty.
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post #9 of 19 (permalink) Old 11-26-2011, 11:16 PM
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That is strange. Good luck with that one.
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post #10 of 19 (permalink) Old 11-27-2011, 09:34 PM
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The only thing I can think of is you rotated your tires. I guess a simplistic view of this would be more friction in tread. In theory moving the tire means you might be wearing down high spots in the tread which means more friction going down the road. That's what I came up with LOL I know it's thin but its a theory.


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