hard · GMAT Verbal
A logistics firm transitioned its delivery fleet from Route A to Route B to reduce fuel consumption, noting that Route B is 5 kilometers shorter. However, total fuel consumption for the fleet increased by 12 percent over the first month of the change.
The fleet manager concludes that the increased fuel usage was caused by the higher number of traffic signals on Route B. Which of the following, if true, most seriously weakens the fleet manager’s conclusion?
- Route B contains several steep inclines that require noticeably more fuel than the flatter Route A.
- A small percentage of the fleet's vehicles were serviced for routine maintenance during the month.
- Drivers reported that the shorter distance of Route B allowed them to complete their daily shifts 30 minutes earlier.
- The price of fuel per gallon increased by 10 percent during the first month of the transition.
- The number of deliveries made by the fleet remained constant during the transition period.
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