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I tried this for one tank of gas on my 01 SF 4x4 and I got barely +1 mpg advantage. The disadvantage is a lot of shifting around town and sometimes forgetting to shift from 1st gear to 2ng gear, which ate up almost all the gas savings. I found that changing my driving habits, i.e. not moving out into traffic until I can easily accelerate without flooring it, pulling my foot off the gas earlier during acceleration, lowering my highway speed from 80+ MPH to less than 75 MPH, etc., works much better and with much less effort. :57:
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