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Below is a table showing where we've sourced the data used to populate the Savings Calculator.

 

Savings Calculator data sources
Item Units Source
Average fuel consumption (Diesel) litres / 100km  https://www.gov.uk/government/statistical-data-sets/energy-and-environment-data-tables-env (ENV0102) The average fuel consumption for a new diesel car
Average fuel cost (Diesel)  pence/litre 

https://www.gov.uk/government/statistics/weekly-road-fuel-prices

Average emissions (Diesel)  gCO2e/ pass km

131 gCO2e / passenger km

[CO2e/VehKM (Scope 1) + CO2e/VehKM (Scope 2- elec) + CO2e/VehKM (T&D, WTT -scope 3)] / average car occupancy * 1000

[0.16843 + 0 + 0.04104] / 1.6 * 1000 = 131 gCO2e per passenger km

https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2021

Average emissions (Electric)  gCO2e/ pass km 

44 gCO2e / passenger km

[kgCO2e/VehKM (Scope 1) + kgCO2e/VehKM (Scope 2- elec) + kgCO2e/VehKM (T&D, WTT -scope 3)] / average car occupancy * 1000

[0 + 0.05549 + 0.01426] / 1.6 * 1000 = 44 gCO2e per passenger km

https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2021

Cost per km (electric) pence/km 

https://www.which.co.uk/reviews/new-and-used-cars/article/electric-car-charging-guide/how-much-does-it-cost-to-charge-an-electric-car-a8f4g1o7JzXj

Most efficient medium or large car: Hyundai Ioniq (2016-) 

Average cost of all charger types converted to km: 

((7.3+9.2+13.1)/3*0.62) 

Cost per km without fuel pence/km 

https://www.nimblefins.co.uk/cheap-car-insurance/average-cost-run-car-uk 

Average cost per mile when fuel isn’t considered converted to km 

((3556-1435)/7600)*0.62*100

Train journey duration Hours:Minutes

Average journey time for train – using journey data from NRE API – https://www.nationalrail.co.uk/developers/online-journey-planner-data-feeds/

To obtain the data we:

- Query for trains 2 weeks ahead, to avoid current train disruption issues

- Calculate average travel time by summing all legs of selected route; and only journeys which occur in the first 2 hours of the day are used in the calculation

Car journey duration Hours:Minutes

Average journey time for a car – using Google Matric API - https://developers.google.com/maps/documentation/distance-matrix/distance-matrix

Calculations

  • Rail CO2 = Rail Distance * Rail co2 per passenger km 

  • Road CO2 = Road Distance * Road CO2 per passenger km 

  • Rail cost = Retrieve the cheapest advance from the station data database. 

  • Road Cost 

    • Diesel in pence = ((Road distance/(100/Average Field Consumption))*Average Fuel Cost) + (Road distance * Cost per km without fuel) 
    • Electric in pence =(Road distance * Cost per km) + (Road distance * Cost per km without fuel) 

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