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  #1  
Old 11-28-2012, 08:40 PM
Millse Millse is offline
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Default 5.9 Fuel Mileage help

Hey guys. New to the site, and to owning a truck as well. Bought an 02 5.9L quad cab about a week ago, and was wondering if anyone had any tips on how to jump my fuel mileage from the dastardly 10mpg i'm getting now? I've heard adding a k&n cold air, and a magnaflow might help. As well as chipping it. Buddy told me with the cold air and exhaust it should bump me up to 15mpg at least, and that the chip on top of that could bump me up to 20, is there any truth to that? Any other options that may be better suited? Any help is greatly appreciated.
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Old 11-29-2012, 02:18 AM
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Marskat Marskat is offline
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Well I'm with you, I have the same truck with the same MPG. Mine has The K&N and magnaflow, I just bought it a few weeks back. I don't know what chip is in it but may put one in, but I heard that the chips are a scam if you don't know what one to buy...I hope you get an answer...I need some myself. But I knew the MPG was going to be bad but I was hoping for 15+ maybe. Hope I can get that...good luck! If I hear anything I'll send it your way.
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Old 11-29-2012, 07:00 PM
Millse Millse is offline
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Thanks man greatly appreciated! i'm also hoping to get around 15, but even a 12 average would be better then what im getting now. So are you still geting 10 even with the k&n and magnaflow installed?
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Old 12-01-2012, 11:13 PM
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major324 major324 is offline
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VOLO.com i used their box plus headers, Fastman TB and KN, and 4" exhaust and i average around 13 to 17 regularly and most recently added an MSD box with top of the line MSD Superconductor wires with E-3 plugs. made a huge difference
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Old 12-02-2012, 09:31 AM
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Cutting the speed really helps the mileage. I've gotten up to 20 mpg on the highway(with the 5.9L) - but I don't drive 75-80 in a 65 zone like a lot of folks do. A reckless driving ticket back in '04 cured me of that.

I stick close to the speed limit, and find that at 60 I get the best mileage. No jack-rabbit starts. I have a K&N element in the air cleaner, stock tires, 3.92 rear end, keep tires inflated slightly on the hard side. If I had a 3.55 gearset in the rear - I'd probably get better highway mileage, but I think city mileage might suffer. I'd imagine a bed cover of some sort would decrease drag a bit, but don't know if it would make a difference in fuel economy or not. I average about 16 mpg, with a 25%/75% mix of city/highway miles.
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Old 12-02-2012, 09:35 AM
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RamTech RamTech is offline
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Originally Posted by fxdrider View Post
Cutting the speed really helps the mileage. I've gotten up to 20 mpg on the highway(with the 5.9L) - but I don't drive 75-80 in a 65 zone like a lot of folks do. A reckless driving ticket back in '04 cured me of that.

I stick close to the speed limit, and find that at 60 I get the best mileage. No jack-rabbit starts. I have a K&N element in the air cleaner, stock tires, 3.92 rear end, keep tires inflated slightly on the hard side. If I had a 3.55 gearset in the rear - I'd probably get better highway mileage, but I think city mileage might suffer. I'd imagine a bed cover of some sort would decrease drag a bit, but don't know if it would make a difference in fuel economy or not. I average about 16 mpg, with a 25%/75% mix of city/highway miles.
That's impressive mileage for a 5.9, especially with the 3.92 gears. As a pilot, I can tell you that decreasing drag will decrease fuel consumption but bed covers don't do as much to reduce drag as you might think. Has increasing tire pressure had any adverse effect on the wear pattern and tread life?
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Old 12-02-2012, 12:02 PM
fxdrider fxdrider is offline
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Originally Posted by RamTech View Post
That's impressive mileage for a 5.9, especially with the 3.92 gears.
This is of course in neutral winds, as I've found a stiff headwind can really kill the mileage. I've always had a knack for wringing the best fuel economy out of a vehicle. When I used to commute with my '96 Ram 3.9L I'd routinely get 22 mpg, when the truck was in its prime. As it got older with more miles on it the mileage decreased to around 19.5. I set the cruise control to 60, get in the far right lane and let it go. On a 44 mile commute, it doesn't take too much more time to make the trip. The natural urge is to go fast, fast, fast, but I find that even increasing my speed to 65 decreases my mileage by at least a mile and a half a gallon.

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Has increasing tire pressure had any adverse effect on the wear pattern and tread life?
I haven't noticed any yet, but I've only been running them this way for about 10,000 miles. I would think it would start showing by now, but maybe it's too soon. I guess time will tell. Probably depends a lot on the tire's rubber formulation - stickier tires tend to wear quicker. I don't blow them up to max pressure (50 lbs. for the tires I'm running), but rather 45 lbs. The recommended pressure on my door label is 35 lbs., which I think is a bit soft for these for the highway. I was running them at 40 lbs. for quite a while, and I did notice better fuel economy when I increased pressure.
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Old 12-02-2012, 12:06 PM
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Originally Posted by fxdrider View Post
I haven't noticed any yet, but I've only been running them this way for about 10,000 miles. I would think it would start showing by now, but maybe it's too soon. I guess time will tell. Probably depends a lot on the tire's rubber formulation - stickier tires tend to wear quicker. I don't blow them up to max pressure (50 lbs. for the tires I'm running), but rather 45 lbs. The recommended pressure on my door label is 35 lbs., which I think is a bit soft for these for the highway. I was running them at 40 lbs. for quite a while, and I did notice better fuel economy when I increased pressure.
I agree. 10k on the clock would have revealed something in the way of unusual wear. I personally run mine a few pounds underinflated in the interest of tire longevity. The Sport King A/T I use is known to wear faster in the center so I run about 3 psi less and this seems to help keep the wear pattern more even.
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Old 01-05-2013, 02:18 PM
Millse Millse is offline
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Quote:
Originally Posted by fxdrider View Post
I haven't noticed any yet, but I've only been running them this way for about 10,000 miles. I would think it would start showing by now, but maybe it's too soon. I guess time will tell. Probably depends a lot on the tire's rubber formulation - stickier tires tend to wear quicker. I don't blow them up to max pressure (50 lbs. for the tires I'm running), but rather 45 lbs. The recommended pressure on my door label is 35 lbs., which I think is a bit soft for these for the highway. I was running them at 40 lbs. for quite a while, and I did notice better fuel economy when I increased pressure.
This may be a somewhat stupid reply, but would there be any negative effects of not following the door label pressure? I'm just beginning to learn about trucks, mechanics, and the like, and was told always follow the door label for tire pressure. Even though with my tires inflated to 35 lbs it constantly looks like I have a flat tire.
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