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Bill,
What size tires are you running? What RPM at say 60 or 70 mph are you running at? Do you know your tranny gear ratio?

19.8 Isn't too bad especially with 3.55's in back, though I would have expected a little better.

Then again if your gas foot is heavy and you scream at 80 mph all the time, I could see a little rougher mileage?
 
Bill,
I agree that it's just the speed issue. With Red that has an AOD, if my wife drives the car we get 22+ mpg. When I drive it, we get19-20.

So with you having 3.55 in the backside, I'd say you are doing just fine.
 
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