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      February
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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
      ItemUnitsSource
      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 (Car - Diesel) kgCO2e/ pass km

      0.1418 kgCO2e / passenger km

      [kgCO2e/VehKM (Scope 1) + kgCO2e/VehKM (WTT -scope 3)] / average car occupancy

      [0.16983 + 0 + 0.04145] / 1.49 = 0.1418 kgCO2e per passenger km

      https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2023

      https://www.gov.uk/government/statistical-data-sets/nts09-vehicle-mileage-and-occupancy

      Average emissions (Car - Petrol)kgCO2e/ pass km

      0.1405 kgCO2e / passenger km

      [kgCO2e/VehKM (Scope 1) + kgCO2e/VehKM (WTT -scope 3)] / average car occupancy

      [0.16391 + 0.04551] / 1.49 = 0.1405 kgCO2e per passenger km

      https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2023

      https://www.gov.uk/government/statistical-data-sets/nts09-vehicle-mileage-and-occupancy

      Average emissions (Car - Electric) kgCO2e/ pass km

      0.0449 kgCO2e / passenger km 

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

      [0.05043 + 0.00437 + 0.01215] / 1.49 = 0.0449 kgCO2e per passenger km

      https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2023

      https://www.gov.uk/government/statistical-data-sets/nts09-vehicle-mileage-and-occupancy

      Average emissions (Rail - DMU/Diesel)kgCO2e/ pass km 

      0.0905 kgCO2e / passenger km

      [[DMU Gas Oil Litres used] * [kgCO2e/VehKM (Scope 1) + kgCO2e/VehKM (WTT -scope 3)]] / [Northern's DMU 22/23 passenger km]

      [[44,425,478] * [2.755 + 0.627]] / 1,659,508,825 = 0.0905 kgCO2e per passenger km

      https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2023

      Average emissions (Rail - EMU/Electric) kgCO2e/ pass km

      0.0275 kgCO2e / passenger km

      [[EMU kWh used] * [kgCO2e/VehKM (Scope 2- elec) + kgCO2e/VehKM (T&D -scope 3) + kgCO2e/VehKM (WTT -scope 3)]] / [Northern's EMU 22/23 passenger km] 

      [[81,700,569] * [0.207 + 0.018 + 0.05]] / 817,370,018 = 0.0275 kgCO2e per passenger km

      https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2023

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

      Calculations

      • Rail kgCO2e = Rail Distance * Rail kgCO2e per passenger km (EMU or DMU used depending on chosen route) 
      • Road kgCO2e = Road Distance * Road kgCO2e 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) 

      Savings Calculator Methodology

      PDF detailing Savings Calculator Methodology.

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