Even if you can't find VR cards at a gas station that codes as a purchase, you could still buy $500 prepaid Visas at a grocery store, then liquidate via AP, AFT, or whatever. You can also get gas discount points (only 1x unlike buying store GCs, but you can still max out their limit, usually $1 or $2 a gallon, every time you tank up). I do this now with my Amex BCP and earn 6%, but that's capped at $6k/year. Maybe you can find VRs at a grocery store too, as there are some listed on their website, but the only place I have been able to find in my area that sells VR with CC is CVS.