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I have been in 5th gear as slow as 20 MPH. Acceleration is negligible, so driving with anticipation is absolutely required. A lot of anticipation. Scangauge says that 5th gets better MPG than 4th at these speeds.
It shakes and I don't want to go over about 10 lbs MAP, but it will pull on a level road or even a very slight upgrade. At that speed the alternator is still putting out current, but not enough to keep the battery fully charged.
Ultragauge is less than half the price of a Scangauge. Both give instantaneous MPG and/or fuel flow.
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