Not long after the IRS approved use of dyed fuel I was fueling at the Pilot at the Pembroke KY exit and noticed the fuel was red . Pilot corporate faxed our office a copy of the authority to use red fuel and we keep that documentation . I avoided that Pilot and watched fuel closely when fueling after that and haven't seen red fuel anywhere else although I heard it was used pretty often in the Gulf area . I don't know how the fuel stops that used it will get the dye out of their tanks .