Technician A says rich ratios of 15:1 to 16:1 provide the best fuel economy. Technician B says lean mixtures have a ratio below 14.7:1 and provide more power from the engine but greater fuel consumption. Who is correct?

Question

Quizplus · Accepted Answer

Rich ratios are typically considered to be below 14.7:1, not 15:1 to 16:1 as Technician A suggests. Lean mixtures are above 14.7:1, contrary to Technician B's statement, and they generally improve fuel economy but may reduce power.

Technician a Says Rich Ratios of 15:1 to 16:1 Provide