Potential cost saving examples
Example 1 - Typical Supermarket or small haulage operation
- Fleet: 30 x 24 Tonne rigid trucks (additional cost of CNG truck £20k each)
- Mileage: 100,000 miles/yr
- Fuel consumption: 10 mpg
- Filling profile: Two fills per vehicle per day (fast-fill) between 6am-12pm & 4pm-10pm
The gas station would be sized for this total load requirement and this daily gas load.
For this example we have a daily gas load of 3,570 Kgs therefore the compressor capacity requirement is 357 Kgs/hr (for a 10 hour run). This in practice would be done using two compressors each sized at 178 Kgs/hr.
Suitably sized gas storage and two gas dispensers would also be installed.
For this example a typical all-in gas price would be in the region of 65 p/Kg.
Existing diesel costs (based on 300,000 gallons diesel, 85 p/lit) = £1.16m (£5.8m over 5 years)
All-in gas price (station, fuel, service etc.), based on 65 p/Kg & 1m Kg/yr = £0.65m (£3.25m over 5 years)
Fuel saving = £0.51m (£2.55m over 5 years)
Additional cost of 30 CNG vehicles (at £20k each) = £0.6m
Total 5 year saving (station, fuel, service & vehicles) = £1.95m
Above figures exclude any additional savings due to reduced VED rates, any congestion charge savings, or any grants that may be available.