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Not just trying to boost your ego here but 7000lbs. to your excursion is nothing, and you will be fine in OD, just keep it 65-70 and your mileage should be fine as well. The only time i switch out of overdrive is on steep hills while pulling and that is just to keep my Exhaust Gas Temps down, and thats with about 12000lbs. you'll be fine!!
I have to agree with bigdieseldav, 7000 pounds is nothing for the Excursion. The only time I would turn off OD is when it starts "hunting" for gears while going uphill. Otherwise leave it on and don't put your foot into it.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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