10-4 by WEX positions itself as a specialized financial tool for the trucking industry, offering direct fuel discounts at participating truck stops nationwide. The application serves as both a payment platform and fuel station locator, specifically designed to address the operational needs of commercial drivers seeking to reduce fuel expenses without traditional credit requirements. The core functionality centers on two primary features: a comprehensive fuel station map showing real-time diesel prices and participating locations, and a secure payment system that generates scannable codes for transactions. The payment system operates through linked credit or debit cards while bypassing standard transaction fees, providing immediate savings averaging 5-10 cents per gallon according to company data. The interface includes route planning capabilities that automatically highlight participating stations along designated routes. User experience reflects practical design considerations for drivers, with large touch targets, offline functionality for areas with poor connectivity, and simplified transaction flows. The interface prioritizes fuel price visibility and station amenities over aesthetic elements, though some users report occasional lag when loading complex route maps. Real-world usage patterns show highest engagement during fueling stops and route planning sessions, with particular value for long-haul drivers covering multiple states. User feedback indicates generally positive reception of the savings mechanism, though notable concerns emerge regarding station participation accuracy. As noted by Adan Jaramillo on June 26, 2025: 'There are some Speedway and Ambest locations that appear on the app only to tell me they don't accept WEX codes when I'm already there and low on fuel.' Conversely, Oscar Madrid's July 31, 2025 review praises the application as 'fun to use [with] great information easy to understand.' These contrasting experiences highlight the application's dependency on maintaining accurate partner station databases. The application demonstrates strongest value for independent operators seeking to optimize fuel expenses without committing to traditional fuel card programs. Limitations include occasional database inaccuracies and regional variations in participating stations, particularly in rural areas. The absence of credit checks and transaction fees makes it particularly accessible for newer operators, though the savings potential depends heavily on route consistency and regional station coverage.