Has anyone else made this observation?

When Oct 15th rolled around the gas station I fill up at had stickers for the ULSD. I noticed it didn't foam as much and though people say there isnt a color difference, I did notice that it was much more clear. The engine noise on this stuff made such a difference that my g/f even noticed it (cuz she hates the noise), and commented on how quieter it was. Now, a month later, I fill up and the stuff has a greenish tint and foams like pre-ULSD. Engine noise is back to loud again. Is this station trying to get rid of old gas? Are there any model year 2007 diesels that have to use this stuff? Are the gas companies saving money by not creating the ULSD?

Tractor Jim

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2005 Black CRD Sport
All J CRD Frankenlift with 500 fronts, Boulderbars, and Superskid
Kilby Gas Skid
Yukon Rear Axles
265/75 16 TrXus M/T's and Bridgestone Revo's
Fumoto Valve
Aero Turbine 2525
Rock Lizard Komodo Bumper
Sundance Custom's Front Bumper

I think the computer adapts to every change. Put a Dynomax exhaust on, the thing ran so smooth I couldn't believe it. About 200 miles later the rattle and snarl was back. Filled up with B10 a few time. Smoothed right out as soon as the bio got to the pump. 200 miles later the snarl was back. Each time the computer was re-flashed (wiped out memory?), it ran real smooth. About 200 miles later the snarl was back.

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2006 Liberty CRD-SOLD
Dynomax 2.5 exhaust

From what I have read the color of the diesel fuel is not an indication of anything, and has no effect.

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06 Jeep KJ CRD Sport full Mopar skids, front tow hooks, rear hitch shackle, Magnaflow muffler, Samco Sport CAC hoses, 02 Airbox mod, Unique series 42 steel wheels.