Fuel Savings Calculator

Calculate potential savings from dual-fuel conversion

Input Parameters

Cost Breakdown Comparison

Per Vehicle Annual Costs

Old Cost (Diesel Only)

Annual Diesel

26073 L

Annual Cost

£29201.94

New Cost (Dual-Fuel System)

Diesel

£24150.01

21563 L

Gas

£3080.61

6287 L

Equipment

£1800.00

£150/mo

Total

£29030.61

Gross Savings (Fuel Costs Only)

Annual Gross

£1971.33

vs Diesel Cost

6.8%

Daily Gross (258 days)

£7.64

Vehicle Type

Mixer

Net Savings (After System & Flogas Costs)

Annual Net

£171.33

vs Diesel Cost

0.6%

Daily Net (258 days)

£0.66

System Cost/yr

£1800

CO₂ Emissions per Vehicle (DEFRA 2024)

Old Emissions (Diesel Only)

Annual CO₂e

80.31 tonnes

80305 kg CO₂e

New Emissions (Dual-Fuel System)

Diesel

66.41 t

Mineral LPG

11.76 t

Total Annual CO₂e

78.17 tonnes

Annual CO₂ Reduction per Vehicle

2.14 tonnes

2136 kg CO₂e saved

2.7% reduction

Calculation Assumptions

  • • Vehicle type: Mixer (258 working days/year)
  • • Fuel preset: Diesel + Mineral LPG (Lowest Cost)
  • • Gas substitution rate: 17.3%
  • • LPG efficiency adjustment: 1.0% (positive value = more fuel needed on LPG)
  • • Gas to diesel energy ratio: 1.38:1
  • • Equipment rental: £150 per vehicle per month
  • • CO₂ conversion factors (DEFRA 2024): Diesel 3.08 kg CO₂e/L, Mineral LPG 1.87 kg CO₂e/L
  • • Gross savings: fuel cost savings only (before system costs)
  • • Net savings: after all costs (equipment rental, Flogas system costs)
  • • Calculations based on annual mileage and fuel efficiency inputs