You're going to save a whopping 18 cents per gallon at the pump?
If gas is selling at $3.75 a gallon, what does that mean?
It means you're saving 5.76 ounces per gallon, or 34.5 teaspoons. Or, if you take an 8 ounce coffee cup and fill it not quite 2/3 full.... well, you get the picture.
You can figure how how much farther you can drive your car for that 18 cents, but by the time you do the math, the price of gas will be $4.00 a gallon.