In the 15 years I've run my current truck, I've noticed what seems to be a sweet spot in the cost of my diesel (all purchased in Pennsylvania). You get fleet discounts, I get company fuel surcharges passed through, I seem to do best, and the economy as a whole when I'm paying about $4.00 per gallon. My steel mill customers serve the fracking industry (pipe and drill bits) , and I'm starting to see their waste volumes edging up, indicating the surviving drillers are getting ready for an increase in fuel pricing. I'm waiting for the current level of federal spending to trigger fuel price inflation, which will leave me running my wheels off.