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I've found that my truck pulls way better without using 6th gear. I used to just let it do its thing using all 6, but towing seems a little easier using just 1-5. Also, I noticed a slight mpg increase. With 4 horses on... from 9.3 to 9.8 and with the tack trailer from 8.5 to 9. (thats highway/turnpike towing with cruise on at 68mph, both goosenecks) Just thought I'd share!