Age range: 14-16
Duration: 0-29 mins
  • Mathematics

Converting to LPG - Fuel efficiency

Use mathematical calculations to decide whether it is worth switching to an alternative fuel

LPG is a by-product of crude oil extraction and the refining process. Many people who consider LPG as an alternative to petrol do so because they believe that the combustion of propane results in lower carbon dioxide emissions. In terms of fuel costs, LPG costs a little more than half the price of petrol or diesel, but fuel economy is about 20-25% lower. Therefore the overall running costs of an LPG car is approximately a third less than a petrol only car – but only once you’ve recovered the cost of the conversion.

Activity info, teachers' notes and curriculum links

An engaging activity in which students will use the data provided to determine whether it is worth converting to LPG. Students will have to take into account the annual mileage, price of petrol or LPG at the local station and size of the car in question.

The activity sheet includes teacher notes, guidance, useful web links, and links (where appropriate) to the national curriculum in each of the four devolved UK nations; England, Northern Ireland, Scotland and Wales.

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