[DK on the road]

Tom, The Jake works great. It will hold me back to an equal speed that I could go up the hill. Example 6% down hill holds me at 50-52 in 10th, 5% down hill in 11th at 55 to 57, never using the service brakes. There are more gears (12) to keep the Engine in the sweet range. Once accustomed to it, you'd never go back.

Ditto on the Mileage comment. I run the California / Nevada Sierra Mtns climbing from sea level to 7,200 and back with several smaller peaks in the middle, in other words, all hills, and I'm getting 5.3 mpg at 63 - 65 mph avg. Out of a 500 mile run, about 100 miles is flat and at sea level.