Technician A says that poor fuel economy can be caused by a defective thermostat. Technician B says that a defective evaporative charcoal canister can cause poor or reduced fuel economy. Which technician is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because a defective thermostat can cause the engine to run at a lower temperature than necessary, which can cause the fuel to not burn efficiently and lead to poor fuel economy.
Technician B is also correct because a defective evaporative charcoal canister can cause a vacuum leak or other fuel system malfunction, leading to poor fuel economy.

Technician a Says That Poor Fuel Economy Can Be Caused