The cheaper gas prices are at the top of the hill, about a mile from the freeway, and the expensive Chevron is at the bottom of the hill, at the middle of on and off ramps.

74 cents a gallon x 10 gallons (for most smaller cars) and obviously that Chevron is profiting handsomely for it's location next to the interstate.

7.50 per car, and maybe 10 per SUV, or maybe 20 per SUV, just for being in a better location.

That's got to be hundreds a day, for a gas station to have a freeway ramp location