# FR - Vehicle efficiency multiplier

**URL:** <https://community.evnex.com/t/fr-vehicle-efficiency-multiplier/114>\
**Category:** Bugs and Feature Requests\
**Created:** [21 April 2022 11:30 UTC](https://community.evnex.com/t/fr-vehicle-efficiency-multiplier/114 "2022-04-21T11:30:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wjiang](https://avatars.discourse-cdn.com/v4/letter/w/cab0a1/32.png) [@wjiang](https://community.evnex.com/u/wjiang)\
**Post date:** [21 April 2022 11:30 UTC](https://community.evnex.com/t/fr-vehicle-efficiency-multiplier/114/1 "2022-04-21T11:30:27Z")

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The charger knows exactly how much energy is delivered in kWh.

The app appears to have a hard-coded vehicle efficiency multiplier of 18 kWh/100 km used for the range added estimate. Where does this figure come from?

Please make it possible to set a custom efficiency multiplier, similar to how the electricity cost is done. That way, people can input a more accurate figure either from WLTP or their own driving habits.

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**Author:** ![TomRose](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.evnex.com/tomrose/32/40_2.png) [@TomRose](https://community.evnex.com/u/TomRose)\
**Post date:** [29 April 2022 02:48 UTC](https://community.evnex.com/t/fr-vehicle-efficiency-multiplier/114/2 "2022-04-29T02:48:52Z")

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Hi there.

As you say, the number is a hard-coded value. It is based on the average value calculated by an NZTA study a couple of years ago. In future we do anticipate being able to match it to your car so that you can get a more accurate picture.

Tom