I don't know the figure but a relative of mine recently found he had to
replace his oil-fired boiler.
There was now gas in the road and it didn't take him long to calculate it
was far cheaper to have gas run into the house and have a new gas boiler
instead of oil. The amortised higher cost of the oil boiler was a
significant factor ....
If it is a new installation then you need to take into account the cost of
the oil tank.
In terms of operating cost my recollection was that oil was lower than gas,
but oil prices do vary, sometimes markedly.
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