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Old 07-02-2014, 10:14 AM
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Better MPG w/o additive?

I have used a few diesel additives to try and improve MPG on my truck (01 crew cab, 35" tires, 4" lift) and the best I could ever get was 14.7mpg mixed with using an additive and driving about 67-69mph with about 30-70 city to highway use. Well, I got sick of going slow and bumped up to 75-77mph and my last fill up, I got 15.7 with no additive (and before that 15.5, no additive). Any idea how this can happen?

I also noticed my truck running better after pulling a 6'x12' enclosed trailer 550 miles. Seems my MPG has went up too after that. Is there any way that the extra load on the engine somehow cleaned it up and is making it more efficient?

Thanks in advance!
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Old 07-02-2014, 12:48 PM
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What additives have you tried???
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Old 07-02-2014, 03:53 PM
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It doesn't surprise me that you have experienced this after significantly working the truck. I think it is extremely important to work these truck the way they wrre ment to be worked on a regular basis. This increases cylinder temps to the point things start to to get clean (Injectors, ebps, etc.). Chronicly low cylinder temps and vehicle not tuned right (think lots of short trips, leaky uppipes and plugged/broken sensors) lead to incomplete combustion causing excessive soot/carbon buildup.

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Old 07-02-2014, 09:53 PM
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Forgot to say I have an DP-Tuner F5 and a cold air intake as well.

I have used Diesel Kleen as well as the Howes Meaner Power Cleaner. Very interesting though.
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Old 07-04-2014, 12:14 PM
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I use a mixture of diesel kleen and TC-W3 2 stroke stuff and best I got on a full tank with about 70 city was 14.3 on a 26 gallon tank and I pull a 6x10 landscape trailer once a week thats about the extent of my pulling and by your Sig it looks like we have similar trucks..

I am about due for an oil change , I was going to do it myself but may bring it to the diesel shop locally and have them do it and check some other stuff...

Would love to be in the 15.5 range, my buddies cummins just got his transmission plates worked on cause there starting to go and he avg 16.8 city and after the plates moved closer together got 17.8...I realize its a inline 6 but man just want to hit the 15s so damn bad hahaha
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