That quoted price was the spot price. It doesn't include Federal or other taxes.
Let's suppose that it did include taxes. Federal tax for jet fuel for non-commercial-aviation use is 21.9ยข/gal so even if the quoted price of $3.135/gal included federal tax, the without-tax price would still be $2.916/gal, which is a lot closer to $3/gal than $2/gal.
(Gas for commercial aviation use is also subject to the federal transportation tax and harder for me to figure out.)
Let's suppose that it did include taxes. Federal tax for jet fuel for non-commercial-aviation use is 21.9ยข/gal so even if the quoted price of $3.135/gal included federal tax, the without-tax price would still be $2.916/gal, which is a lot closer to $3/gal than $2/gal.
(Gas for commercial aviation use is also subject to the federal transportation tax and harder for me to figure out.)