Things I Don't Understand

Had some errands to run today. They took me approximately three miles north of work and three miles south of work. As most of my travel time was spent on 965, I saw a lot of gas stations. The price per gallon for unleaded with Ethanol, my usual selection, varied from $2.02 to $2.03 to $2.09 to $2.15 to $2.18. Huh? Same product, more or less, right? Indeed, the $2.02, $2.09, and $2.15 were all at different BP stations. Let's add gas prices to the list of things Dweeze doesn't understand.