I am highly considering buying a RL within a couple of weeks. I talked to the sales manager at the dealership and he says that the car runs on 87 octane gas. I have a Grand Prix GTP ( 3.8 liter with a supercharger). i was told that because of the Supercharger that I need to only put in 93 octane gas. It was explained that the high temperature of the forced air can cause knock retard in the engine. Maybe because the RL is intercooled that it can run 87 octane. If it is only a power issue then that is no big deal, I will just put in 93 when i can. I just want to know if I can get by with 87 with out doing any engine damage. I need a car that is far cheaper to run thatn the GTP. Also i live in NC, near water level (if that helps). Thanks in advance.