I was just on a long trip, from Texas to Illinois. Prices ranged between $1.28 and $1.69, needless to say I didn't stop at the higher stations. Most prices averaged around $1.35. The diesel that was $1.69 was still $.10 cheaper than regular.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k