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Is it AT or MT? GE8 or GD3? The MT's are going to be at a higher rpm than the AT's at the same speed. It's just how thing's are geared. The AT, I'd imagine, gets a little better gas mileage on the highway than the MT does. In my MT GD3, I've gone 65-70mph for a whole trip and still got over 37mpg (which, surprisingly, is only a few mpg better than any of my all city tanks!)
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