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Pontiac Grand Prix Fuel System
also, i travel on rte 295 in s. jersey same stretch every day when i go to work and few times i've tried cruise control at 80mph (b/c of the posts seen here), sometimes DOD has definitely kicked in b/c i'm getting at least the upper 20's and maybe higher (can't remember) mpg, while other times it's lower, but i've noticed more wind resistance.
chats1 sorry about your hum, but mine is not loud and goes off as soon as you turn the car on too...maybe it is onstar.