Trust me, that drop in fuel mileage will be a lot less than a transmission replacement. It is better to keep the RPMs up a little and have less down shifting, hence overdrive off when towing. This is why the manufacture says keep it off when towing.
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George Scott
2015 Salem Hemisphere Lite 272RLIS
2006 Heartland BH 3400/Summer Home
2021 Sabre 37FBT
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