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I too have a grand prix abell. I just use the cruise at 50-55mph and coast as long as possible coming to stops. If you don't have the supercharged GP, I wouldn't go above 60-65. The gearing in our cars isn't that great compared to other W body cars. I tried P&G, but it is easier to just cruise. Not to mention most of my commute is 2 lane so it tends to upset people around me.
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