10.5 miles a gallon???? - Ford Powerstroke Diesel Forum

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post #1 of 22 Old 12-19-2010, 05:57 AM Thread Starter
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10.5 miles a gallon????

My trucks a 97 psd ext cab long bed 4x4 with the e40d and 4.10 gears..... I have great fuel additive i put in the truck and it has a cold air intake and i am still only getting 12.5 mpg with the additive in, without it it gets 10.5 i just got the truck handed down to me from my dad after it sat for like 6 months because of an oil leak. it was taken to the ford dealership and every little thing they could find wrong with it was fixed. before it sat it was used as a work truck for 200000 miles and it always got around 17.... I commute 20 miles to school and back every day and all of my driving is highway at 65 mph with the cruise control set. I need help why is the mileage so low??? how do i fix it??
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post #2 of 22 Old 12-19-2010, 10:30 AM
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does it smoke a lot or run hot? you might have a bad nozzle on an injector just dumping fuel

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post #3 of 22 Old 12-19-2010, 07:02 PM Thread Starter
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no it runs smokeless and i dont have an egt gauge but the water temp gauge never reads past the "r" if that means anything....
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post #4 of 22 Old 12-19-2010, 07:05 PM
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not really, the water temp gauge is sorta an idiot light. How is the oil level? i wonder if an injector o-ring is bad and fuel is getting into the oil

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post #5 of 22 Old 12-19-2010, 07:31 PM
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check to see if its leaking fuel also, check in the valley of the engine.
also if you have the factory catalytic converter, it is possible for it to be plugged, mine was plugged up pretty good at 198k compared to my truck with 84k at the time
Also keep in mind that with 4.10s if you go over 65, fuel mileage will decrease exponentially for every mph you go faster.


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post #6 of 22 Old 12-20-2010, 07:55 AM Thread Starter
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How can i check to see if theres fuel in the oil? and im deleting the cat next month with a 3 inch down pipe to a four inch straight pipe
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post #7 of 22 Old 12-20-2010, 09:59 AM
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Do an oil change? check the dipstick. you will be able to tell if the oil isnt right

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post #8 of 22 Old 12-20-2010, 03:21 PM Thread Starter
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Well ive checked it and the oil in its got around 2500 miles on it. what else could it be?
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post #9 of 22 Old 12-20-2010, 03:24 PM
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a fuel leak you arent seeing? how is the valley of the motor. Is there any fuel at all in there?

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post #10 of 22 Old 12-21-2010, 06:28 AM Thread Starter
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I checked the engine valley and its dry. I dont mean to be a pain...... what else could it be?
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