Nominal and real fuel prices

Definitions:
‘All petrol’ is a consumption-weighted average price of both leaded and unleaded fuel, which is corrected using the energy content of an equivalent amount of unleaded petrol.
‘All fuel, unleaded petrol equivalent’ is a consumption-weighted average price of unleaded and leaded petrol and diesel, corrected using the energy content of an equivalent amount of unleaded petrol.
‘Nominal’ is the price with no adjustment for inflation.
‘Average, all fuel, unleaded petrol equivalent (real, weighted by consumption)’ is the consumption-weighted average of the ‘All fuel, unleaded petrol equivalent (real)’ line across the full time series.
'Real' is all transport fuels, expressed as the equivalent consumption in unleaded petrol, corrected for inflation to 2015 prices.