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Dual fuel is it really worth it?
Page 20
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JOHN PETTITT from Clean Air Power (CAP) (CM 14 August) urges the UK Government, 'to support and encourage the use of natural gas' as 'the fuel of choice' for the road haulage industry.
As far as dual-fuel (diesel/CNG or LNG) systems such as CAP'S are concerned, a key reason for the Government's reticence is that, since natural gas filling points remain few and far between, provision has to be made for the driver to switch over to 100% diesel fuelling, at which point the environmental benefits disappear.
So any fiscal inducement by way of discounted road tax for dual-fuelled trucks and vans would he open to exploitation.
A requirement for available power and torque to be cut back automatically when dual-fuelled vehicles are running wholly on diesel — similar to that of the OBD-linked provision when NOx emissions rise above a pre-set level — could be used to deter 'non-gas' operation.
Another alternative fuel story that cropped up in the same issuL of CM refers to the use of landfillsourced biomethane by waste management company Veolia.
You report that the fuel supplier, Gasrec, claims a 70% reduction in CO2 emissions, compared with that of regular diesel.
No doubt similar to many other readers of CM. I would like to know how that hugely impressive figure was calculated.
Alan Bunting Harpenden Herts