My knowledge of Illinois vs Wisconsin gas prices is a bit out of date (but I'm current on where to get cheap gas in and around Rancho Bernardo in San Diego).
But, I do recall from many interstate trips that gas prices usually change, often dramatically, when crossing state lines because of the tax difference. According to the first hit when Googling "State Gas Taxes" I can see that Illinois' tax is $0.09/Gallon plus either 6.55% or 6.82% depending on how two taxes actually get added in. Wisconsin is at $0.321/Gallon. So for $2.50/gallon base those come to $2.83, $2.86, or $2.70 (again unsure what taxes apply to other taxes) for Illinois and $2.82 for Wisconsin. If the base prices are higher, then the difference will go up.
Of course other regulation gets in the way too. I think both California and the Chicago area (which may or may not include the Rockford area) require specially formulated gas at least part of the year which also adds to the gas prices.
FWIW, in 1999 when I moved from California back to Illinois, gas prices went down noticeably each time i crossed the state line, until I went from Missouri to Illinois where they jumped back to nearly California prices. The biggest drop was California to Arizona.
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branchandroot
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Date: 2010-06-16 03:09 pm (UTC)But, I do recall from many interstate trips that gas prices usually change, often dramatically, when crossing state lines because of the tax difference. According to the first hit when Googling "State Gas Taxes" I can see that Illinois' tax is $0.09/Gallon plus either 6.55% or 6.82% depending on how two taxes actually get added in. Wisconsin is at $0.321/Gallon. So for $2.50/gallon base those come to $2.83, $2.86, or $2.70 (again unsure what taxes apply to other taxes) for Illinois and $2.82 for Wisconsin. If the base prices are higher, then the difference will go up.
Of course other regulation gets in the way too. I think both California and the Chicago area (which may or may not include the Rockford area) require specially formulated gas at least part of the year which also adds to the gas prices.
FWIW, in 1999 when I moved from California back to Illinois, gas prices went down noticeably each time i crossed the state line, until I went from Missouri to Illinois where they jumped back to nearly California prices. The biggest drop was California to Arizona.