Gas price rant, (what are you paying)???

I live on an Island 30 Miles from Bellingham and regular gas is 4.83 while the premium is 5.05 .

Ouch . Your farely close to the source also. What i don't under stand is supposidly our oil over here is sold in lots. They come up the Columbia river to the Tri Cities and then distributed. Now let say Cheveron buys four lots. I don't know what a lot is but say four barges ,four lots. If that asking price is $4.00 a gallon at the pump for this lot, how can it fluckuate from $4.00 to $4.50 a gallon through out Chevrons district for those lots.
If you talk with a station manager they say their only getting from 1 to 3 cents on the gallon.