My truck runs best about 60 to 62 to stay in 6th gear. Sometimes I'll go to 70 to get by the string of trucks and keep out of the way of the 70+ crowd who are very impatient if you get in their way. Going down I-5 in Oregon and California there are way too many trucks to put up with and makes passing almost impossible. To get by a long string you have to get up to 70 so you aren't blocking the fast lane.
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