80-economy, even though I didn't use it much. 80-tow for trailer less than 8,000 pounds or less, or 60 tow for trailer of 8,000 to 10,000 pounds.Ģ. If I were going to install a chip today, I'd go with the plain DP-Tuner multi-position chip and have at least 4 tunes with a tune-switcher that DP-Tuner sells.ġ. I had a separate exhaust brake, which is required in hills or mountains. I also had 80-economy but it didn't seem to offer any advantages over 80-tow, so I usually just left it in 80-tow all the time. 80-tow was perfect for towing my 8,000-pound 5er on the flats or in the hills and mountains.

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