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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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