Within a ten mile radius of my home in far north suburbs of Chicago (just south of Wisconsin border), 87 octane (often blended with 10% ethanol from corn - a gift from Congress to ConAgra and Archer Midlands, the two major producers of ethanol) ranges from $2.20 to $2.45, depending on location (rich suburb or farm town.) There does not seem to be any consistency among brands. We have a Mobil and a Citgo kitty-corner across from each other at a major arterial highway intersection. No "price war" here, except in reverse. One day Mobil will be five cents higher, two days later, Citgo will be one cent higher. They NEVER have the same price.
In regard to taxes - don't you wish every state had a law like Oregon's?
Section 8.(1) As used in this section, ‘gas station’ includes a filling station, service station, garage or any other place where gasoline is sold for use in motor vehicles.
Section 8.(2) The owner or operator of a gas station shall post, in a manner visible to customers, the following information:
- The amount of the price per gallon that is Federal tax;
- The amount of the price per gallon that is state tax;
- The amount of the price per gallon that is local tax; and
- The total amount of Federal, state and local taxes per gallon.
Section 8.(3) The Department of Transportation shall furnish the information described in subsection (2) of this section to each gas station in the state.
I'd prefer it in a BIG sign on every gas pump.
NOTE: Some states and local taxing bodies throughout the U.S.A. tax by the gross dollar of sale (a sales tax) rather than a flat rate per gallon. This is especially true of local municipalities which are enjoying a windfall in increased taxes, even if people are more conservative in the number of gallons they use.
I have to add that the last time I checked over 70% of that was tax! 
