A 2013 GMC Sierra flex fuel truck incorrectly adjusts the fuel alcohol mix when using regular gasoline, causing poor gas mileage.

No specific solution is available to diagnose or correct the flex fuel mix without a sensor; DIY diagnostics and forums are insufficient.

Severity

4High

Willingness to Pay

implied

Added

May 5, 2026

Implied Software Gaps

Diagnostic software that identifies incorrect flex fuel mix settings in older GM vehicles without a sensor

App Concept

FlexFuel Fixer

FlexFuel Fixer is a diagnostic tool and app that identifies incorrect flex fuel mix settings in GM vehicles without a sensor. It provides step-by-step troubleshooting, repair recommendations, and can connect to the OBD-II port to read engine data, restoring correct fuel mixture for gasoline.

Key Features

OBD-II diagnostic tool for flex fuel systems
Step-by-step troubleshooting guide
Vehicle-specific repair recommendations
Alert system for abnormal fuel mix settings

Target Users: Owners of flex fuel GM trucks (2010-2014) experiencing poor gas mileage due to incorrect fuel mixture

Revenue Model: $59.99 one-time purchase for the OBD-II tool + app access, $9.99/mo subscription for premium diagnostics and repair database

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