Conventional wisdom suggests that rolling down windows and turning off the A/C/ during summer driving can help improve fuel economy. However, a group of SAE International engineers hope to enlighten drivers about this misconception.
The member sof hte group's Interior Climate Control Standards Committee have authored a paper that acknowledges the heavy energy-consuming A/C system but reports that the increased drag created by the open windows counteracts the savings of cutting off climate controls.
The impact of A/C use on a vehicle's fuel economy can be as much as 30 percent for full A/C use versus turning off the system, according to the report.
Read the full report here.
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