First year ('84) Tempo/Topaz had a "Fuel Saver" 4-speed which featured a higher final drive ratio than the 5-speed. Can't put my finger on fe figures but I think the 4-speed was rated higher.
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Tempo/Topaz:
Old EPA 23/33/27
New EPA 21/30/24
F150:
New EPA12/14/17
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