The Dual Fuel Vehicle Modelling project was designed to assess the financial and environmental viability of converting heavy-duty diesel vehicles to operate on compressed natural gas (CNG) or biomethane. Led by Queen’s University Belfast, the project involved collaboration with AgriAD, Northern Ireland Water, and TG Haulage.
Two vehicle trials were conducted using TG Haulage’s fleet. The first involved retrofitting a Volvo FM13 truck with a dual fuel system, while the second tested a dedicated natural gas Iveco Stralis NP vehicle. Real-world performance data from these trials informed the development of financial and emissions models, enabling fleet operators to assess the viability of switching to alternative fuels.
The dual fuel Volvo truck achieved a 27% reduction in fuel costs compared to diesel-only operation, with a payback period of less than two years. Crucially, the project also demonstrated significant environmental benefits. The dual fuel system reduced carbon dioxide emissions by approximately 15%, while the use of biomethane—produced from anaerobic digestion—offered even greater savings, with potential reductions of up to 80% compared to conventional diesel.
CASE funding supported the trials, model development, and industry engagement. TG Haulage gained operational insights and cost-saving data, while AgriAD explored new opportunities in biomethane production. The project provided a strong evidence base for future investment in renewable transport fuels and highlighted the role of locally sourced biomethane in decarbonising Northern Ireland’s heavy vehicle fleet.