Loss of MPG? what gives? - Ford Powerstroke Diesel Forum

 
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post #1 of 3 Old 11-23-2009, 07:41 PM Thread Starter
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Loss of MPG? what gives?

Guys, question is, what would cause my 6.0 to begin dropping MPG. it is a considerable loss. 2005 F250 FX4. K&N Air intake and filter. Magna flow SS exhaust. Juice edge. I purchased this truck new and have kept records on it since new and all maintence is up to date. Before the sulphur removal from the diesel I could expect 20-21 mpg at 70 mph on the interstate. I tow a 36 foot fifthwheel which is about 14,000# loaded. I could expect 13-14 depending on conditions towing.
Currently this past week I got only 8 mpg towing and running empty 70 mph I was only able to see about 15 mpg. If I was only losing a 1-2 mpg I would expect it and move on. But this stinks. Anyone have a idea?

Thanks, Mark
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post #2 of 3 Old 11-23-2009, 07:47 PM
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This is interesting because I am seeing the same thing with my truck. I have lost about 3-4mpg over the past 2 weeks. Quality of fuel??

2004 F-250 super duty 6.0 (early) 190k miles
4" turbo back to 5" exhaust
cat delete
AFE cold air intake
Elite diesel complete EGR delete
Ultralite II guages
SCT custom tunes by tadd at elite diesel
recon projector headlights
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post #3 of 3 Old 11-23-2009, 07:56 PM Thread Starter
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It has to be a fuel issue I would think. I changed the fuel filters thinking that I might have picked up some trash. That did not fix the problem.
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