The computer reads the speed through the speedometer. If it is not getting the correct speed, the computer is adjusting the fuel rate for the speed the sppedometer is saying,not what the truck is actually doing. In your case the speedo is reading about 25% fast,so it is adjusting the fuel rate to maintain 80 KPH when it is actually running 60 KPH. It is a closed loop system so everything has to be correct to obtain maximum mileage,while still retaining driveability. So the engine has to be at proper operating temperature, the truck has to be moving at the speed the speedometer is reading,etc.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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