More Boost to Pull Same Load??

[Big John]

The last time or two out with my trailer I have noticed that it takes more boost to run the same mph. I usually drive by boost pressure, loaded around 10 to 12( = @65mph ) and unloaded around 6 to 7. This combo has always given me great ecomomy and plenty of power in reserve.
Recently I have noticed that my boost is running in the 14 to 18 psig range to get the same mph. Trailer is the same, same tires, same basic topography. My milage has also fallen off 1 to 2 mpg while pulling, but not while empty.
Any ideas? I thought that it might be weaker fuel due to time of year, but I have not seen this in previous years. Any help or suggestions would be appreciated.

Big John ( this is the '96 5sp )

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'94 2500 Diesel Reg. Cab
Auto 3. 54 4X4 TST 230hp
"If you can't Dodge it, Ram it!
'96 2500 diesel clubcab 4x4 5speed

 

[Red Rocket]

I doubt this applies to dodges, but my dads Powerstroke had problems with the 4x not disengaging with the dandy switch on the dash, and he lost mileage. Though he doesn't have guages, if what you say is true, there must be more drag on the engine, so it could be in the driveline. Oh, as a sidenote, if he had guages, he could have had a chance to notice the difference. Another reason for guages. He had major repairs (under warranty but still not good) at 20,000. Just trying to help.

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1998 2500, auto, 3. 54, 285/75-16, TST 230/605, t/c switch, DiPricol EGT/boost guages,K&N,camper special, 65,000 miles,
12 ton goosneck!

 

[illflem]

I have a feeling, but nothing to back it up, that since diesel prices went down so did the quality.