HAS diesel had its chips?
Green-minded staff at Kirklees Council certainly hope so, if trials of a new fuel made from cooking oil are successful.
Skelmanthorpe dustbin crews normally pick up gunge like discarded frying oil.
But from Wednesday, February 4, it's going to be powering their vehicles along village streets and up country lanes.
Staff at Kirklees Council's Environmental Services Department will study the new bio- diesel for about six months, for fuel and cost efficiency as well as smoke emissions.
They may then decide to use it in all 80 heavy wagons.
The council runs about 960 vehicles and one day most could be powered by the fuel.
It is made up of a mix of 5% vegetable oil and 95% ultra low- sulphur diesel.
Millions of litres of used cooking oil and waste frying fat are disposed of every year.
A revolutionary cleaning process means that waste product can now be put to good use.
"This is probably one of the most exciting things I have ever been involved in," said Roger Wilson, Kirklees's environmental waste and transport manager.
He said the implications for greener fuels over the very long term were far-reaching.
If technology permitted, the world could potentially grow its own fuel.
Oil made from soya beans and rape seed can also be used in the mix.
"This is something which will eventually be a totally renewable source of energy," said Mr Wilson.
Bio fuel costs no more than low-sulphur diesel, thanks to green tax breaks set up by Chancellor Gordon Brown.
Bio fuel hit the headlines at the end of 2002, when police in Llanelli, south Wales, found that motorists had been making their own cheap - and highly illegal - version.
Sales of oil at Asda's Swansea branch rocketed. Staff rationed the amount sold to shoppers while police officers in a hastily formed `frying squad' were sent to catch the culprits.
Makers of the homebrew fuel saved 40p per litre.