Might want to use "tow/haul" mode, if you have it and keep the trans in 3rd gear for the 3 mile drive and see if it helps. 3 miles with mine in cold weather takes longer too, but there isn't anywhere I can get in 3 miles around here.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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