87 is no more "piss poor" than 91. it has less octane. If you understand combustion, gasoline and thermodynamics. then, you would realize that for the micra 91 is piss poor. 87 octane makes more power, therefore you will get better gas milage, and also, be heavier in the wallet. Same with my Jeep patriot. 87 gets better milage than 91....why? because it makes more power. Look it up sometime before making blanket statements like piss poor gas if you have no idea what you are talking about.