Correct answer
Keep revs in the lower part of the green range without making the engine labour.
Keep the engine in the lower part of the recommended green range, without reducing revs so far that it labours or loses necessary response. The range and shift point depend on the engine and manufacturer’s instructions. Gradient, load and acceleration needs may require other revs or a lower gear. There is no universal RPM figure, and running in the red range is not a fuel-saving method.
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Always keep revs at the top of the green range, even when those revs are unnecessary.
Keep revs in the lower part of the green range without making the engine labour.
Keep revs in the red range to reduce fuel consumption.
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