Here's another example from current (9-6-16; ~9AM) AZ diesel prices off Gas Buddy.
From PHX:
Love's at 83rd Ave., S of I-10: $2.34
Shell, with truck pumps at 51st Ave., S of I-10: $2.01.
From Yuma:
Love's at Ave. 3E, S of I-8: $2.49.
Baron Fuel on 16th St./Hwy 95 about 3/4 mile E of I-8: $2.08.
41 cents per gallon difference. Why would I =not= give Baron my business?
Even with discounts from Good Sam's, Love's CC, etc., I can virtually guarantee you you're not going to make up that kind of difference, IMO.
Lyle
