This is just my opinion so take it for what it's worth, but I wouldn't put all your faith in what the people at the dealership say!!!!
I think in 2 years I've put 91 in my car twice. I always use 93 b/c that's all they have at the station(s) I normally go to.
I agree with a few others on here about taking care of your car. If you can't afford to have it and take car of it properly then you need to get rid of it and find a more "financial friendly" mode of transportation. Either way it's your car so do what you want, but don't bitch when you may have problems later on.
At any rate, Clyde I hope some others in this thread have been able to shed some light on your original question.