Picked some up and added between 2-4 ounces to the car (I know not the most ideal measuring, but enough to hopefully get some low RPM results. Will update on the drive home when I hit the highway.
Seemed to be 3.87 for a 32 ounce container at "wally world." That comes to under 25 cents per fillup if 2 ounces is used. Not bad especially since it comes with a long neck that allows for easy filling.
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