We have a simulated city circuit at the Consumer Reports Auto Test Center that replicates the speeds and periodic stops drivers would typically experience in an urban setting. This requires a staff mechanic to cut the fuel line and splice in the meter, which measures gas consumption precisely by the CC, or cubic centimeter. We install an inline fuel meter for our fuel economy tests, rather than take a rough measure by topping off the gas tank. (Our tests are performed in the default mode, typically “Normal,” when there are driving modes to choose from.)Įco typically reduces throttle response, for milder acceleration, while shifting earlier, keeping the engine rpm lower to conserve fuel. You often see Comfort, for mild-mannered driving, and Snow, to address winter weather challenges. The most common modes are Eco to optimize fuel economy, Normal, and Sport to increase response, primarily by holding shifts to keep the engine revving higher, where the power is more accessible. Selectable modes let drivers fine-tune the power delivery characteristics by letting the car’s computer make adjustments to throttle mapping that controls the engine performance, shift mapping for the transmission, and all-wheel-drive response, if the vehicle is so equipped.
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