What is a common indicator of too-high fuel consumption in a forklift?

Frequent need for refueling is a common indicator of too-high fuel consumption in a forklift. This suggests that the forklift is using more fuel than expected for the amount of work being performed. When fuel consumption exceeds normal levels, operators will notice they have to refuel more often, indicating inefficiency in fuel usage. High fuel consumption can result from various factors including engine performance issues, improper maintenance, or operational inefficiencies.

The other options may contribute to performance issues but are not as direct indicators of excessive fuel consumption. High oil viscosity can affect engine performance but is more related to the engine's lubrication rather than its fuel efficiency. Low engine temperature can indicate that the engine is not reaching optimal operating conditions, but it does not directly signal high fuel consumption. Inconsistent engine power can point to performance problems, yet it does not specifically indicate that fuel is running out quickly. Thus, frequent need for refueling is a clear and direct sign of too-high fuel consumption.