This may only apply in Arizona, not for sure. Other day went to fuel at a place I don't normally go to. They have a number of pumps one side had large nozzles and the other small and are labled as such with big red leters. The large is intended for commercial and small for non as we all know. In Arizona the commercial pays an extra 8 cents per gallon. Not here to debate that charge being correct or not.
So if it is worth it to you to get fuel in faster for the extra money so be it. I just want to caution everyone to be aware of it at least in this state.
I have seen some places that have one pump for everyone and when you go inside they give you the 8 cent discount if necessary at stops you would not think have commercial trucks fueling. But you have to ask if the 8 cents is included or not. Anyway just a caution. 



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