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Oct 20-22, 2026 | MD

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Graphic from Questar Auto Technologies showing a chart that links persistent diagnostic trouble code (DTC) activity with increased idle fuel consumption. The chart highlights periods of high-impact DTC events and elevated fuel use over time. Accompanying text states that aftertreatment issues can drive higher idle fuel consumption and contribute to excess fuel costs for fleets.

News•Lauren Fletcher•June 11, 2026

Questar Analysis Finds Aftertreatment Degradation Can Cost Fleets Up to $30 Per Vehicle Per Day in Excess Fuel

Questar analysis found degraded DPF and SCR systems can waste up to $30 in fuel per vehicle daily, creating significant avoidable fleet operating costs.

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