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I think you already answered your question. 4th gear unless you are not holding up traffic. 5th at 22MPH can't be good for the engine. Once had a 63 Valient that would not climb a 7% grade in high gear, 3 speed manual. Downshift to second at 35, up shift to third at 50, gradually loose speed, rinse and repeat until I got to the top.
regards
Mech
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