Large Goods Vehicle (LGV) Theory Practice Test 2026 – All-in-One Guide to Master Your LGV Certification!

Max fuel economy comes from keeping the engine in a moderate, efficient RPM range. That is shown on the rev counter by the green band. When the engine runs within green, it produces enough torque without revs that are too high, so fuel use stays low. If you move into the amber area, the engine is revving higher and starts consuming more fuel to maintain power. Red is the high-rev zone where you risk wasteful fuel consumption and potential engine strain. Blue isn’t a standard marker for economy on typical rev counters, so it isn’t associated with optimum fuel use. To stay in the green, shift up early enough to keep the RPM in that economical range and avoid both lugging the engine at too low revs and revving too high.