I can confirm the lockup part of it with my '98 Stratus with 4-speed auto. The 3-4 shift is at 36 mph, lockup at 46. If you then let the car slow down slightly, it goes out of lockup at about 42 and the revs go up.
However, 3-speed revs per mile are near those for the 4-speed, so mpg with the 3-speed should not be that bad unless the 3-speed doesn't have lockup.
Ray Mac
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