A Jeep Grand Wagoneer renter filmed himself using 87-grade gasoline. He says it's fine—but is it really OK for your engine? ... Jeep Grand Wagoneer calls for 91-grade gasoline.

Vigilante’s Hellcat-powered 1988 Jeep Grand Wagoneer As the electric Jeep Wagoneer S was making its debut, Texas-based Vigilante was busy taking the nameplate in a completely different direction.