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If the hill is the perfect grade then you can maintain 80% load in top gear.
If the grade is less, maintain 80% and increase your speed.
If the grade is more bleed your speed and maintain 80% load.
You have to consider the load and the amount of time it takes to reach the peak of the hill. Least time in top gear while maintaining 80% load is your objective.
If you can't maintain 80% load in top gear, then try the next highest gear with 80%. The 80% is your best efficiency but the longer it takes you to climb the grade the greater time spent at lower mileage.
regards
Mech
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