I never saw any evidence of Deere tractors using excess fuel due to closed center pumps. Deere tractors with PowerShift transmissions did cause some loss. One example, to make a fair comparison - here are two Deere tractors that are almost identical except one has an open center pump and the other closed center. Same engines, same basic tractors. The closed center tractor actually tested with better efficiency, not worse.
Deere 820 with 152 diesel - best fuel - 14.2 horsepower hours per gallon. Open center pump.
Deere 1010 with 152 diesel - best fuel - 15.4 horsepower hours per gallon. Closed center pump.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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