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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•by 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.

Closeup of hand touring bottle of DPF cleaner into a fuel tank.

Products•May 13, 2025

6 Signs Your Diesel Vehicle’s DPF Needs Cleaning

Learn when to clean your car, truck, or SUV's diesel particulate filter, plus other helpful DPF tips from Rislone.

Products•March 18, 2024

Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner Removes Crystal Deposits

Rislone said its DEF Crystal Clean Diesel DEF and SCR emissions system cleaner scrubs away crystal contaminants from the selective catalytic reduction (SCR) systems of diesel cars, trucks, and SUVs.

From Our Partners

Optimizing Fleet Safety with Secure Device Integration

Sponsored by Bulletpoint Mounting Solutions

Unsecured devices are a hidden liability. Learn how precision-engineered mounting solutions enhance driver safety, streamline workflows and protect your technology.

Products•April 3, 2018

Aftertreatment Replacement Filters

Denso's PowerEdge line of diesel particulate filters and diesel oxidation catalysts covers light- and medium-duty Ford, GM, Sprinter, Dodge, and Ram trucks.

Articles•April 4, 2017

Aftertreatment System: A New System Not to be Overlooked

Many fleet operators may not realize that aftertreatment systems are often vulnerable to compromise and failure due to seemingly minor and unrelated causes that have been largely ignored in routine maintenance practices.