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Old 04-17-2012, 09:23 AM
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Low fuel mileage

Hey guys so I know this topic comes up a lot but I have a few questions. This past weekend I towed my boat (about 2500lbs) about 170 miles and used half a tank of fuel which doesn't seem right. Now I know I need to change air and fuel filters but my question is how bad can those affect mileage? I'm not expecting real high mileage out my truck being on 38x15.50 tires but I was hopping for more than im getting. can a gutted cat with out a pipe through it hurt flow and in turn hurt my mileage? I had other questions in my head but can't think of then right now but when I do I'll post them.
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Old 04-17-2012, 03:04 PM
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Any one able to help me out
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Old 04-17-2012, 03:07 PM
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Well, how full was the tank before hand?
It's not really accurate to go off the gauge. Best way is fill it full, run it getting mileage, fill it the same way again, and then find your miles traveled divided by your gallons filled up.
If the air filter is dangerously clogged it might do something, but you'd have other problems by then. Fuel filter, you might get low mileage also, but nothing drastic I don't think.
A gutted cat, and a free flowing exhaust for that matter, will HELP your mileage.
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Old 04-17-2012, 05:11 PM
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I stopped and filled tank till it clicked before I hit the road. Haven't really noticed anything else other than a weird inconsistent idle every now and then.
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Old 04-17-2012, 06:13 PM
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The idle can be all kinds of things. HPO or fuel basically.
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Old 04-18-2012, 04:25 AM
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Well hpop is a year old. And I've done the 6.4 banjo bolts and blue spring mod. What can I check or test to see whats going on possibly
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Old 04-18-2012, 04:34 AM
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Check PIDs while running. ICP, fuel pressure.
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Old 04-18-2012, 04:55 PM
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How big is your tank? 2500lbs shouldn't phase you unless it catches a ton of wind. What do you get unloaded?

About 11mpg loaded (6k tractor + 4k trailer) and 16mpg unloaded is what I get with similar mods minus the tires.
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Old 04-18-2012, 05:44 PM
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Should be 29 gal tank with the short bed. I doubt it is catching a lot of wind seeing as the windshield is only about 6inches taller than the bed of my truck due to being lifted with drop hitch. Not sure what I'm getting unloaded I haven't filled my tank in a while just put enough in it to go where I need to go kind of thing.
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Old 04-23-2012, 07:56 AM
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So I changed my fuel filters but still to early to tell but I also dont think thats it. Still looking for other possibilities.
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