Name: DR4c0 Datarun Premium with 4 metrics
Rating: 5 (5 reviews)
Author: Joop_Verdoorn

This is a free datafield now! However, I don't develop this datafield anymore and I will not add any watches.
Source can be found at https://github.com/JoopVerdoorn? and at https://www.vermail.nl/datarun_code/
If you want a license key for an earlier version than 2.50, the spreadsheet with the calculation can also be found at https://www.vermail.nl/datarun_code/

See the manual at https://vermail.nl/datarun-premium/ for all the options! This version of Datarun premium has 4 metrics and comes with additional copy versions. Other versions with less metrics are also available:
5 metrics: https://apps.garmin.com/nl-NL/apps/a791fa75-714e-4679-9d8e-ffce09f8069e
6 metrics: https://apps.garmin.com/nl-NL/apps/665468ea-2f51-412b-be2f-9c1ea777901f
7 metrics: https://apps.garmin.com/nl-NL/apps/360a26c4-e2bb-45b7-8f97-2694ccf74eef

Warning: Stryd running power metrics don't work for the FR245m and FR645[m], as they can't recieve bike power data. 
All the other watches can enjoy these 36 metrics:
- Pace averaged over the last 3 or 5 seconds
- Required pace to meet a certain finish time
- Speed averaged over the last 5 seconds
- Lap heartrate
- Last lap heartrate
- Average heartrate
- Running power (from the Stryd footpod for example)
- Power averaged over the last 3 seconds (also used for power alerts!)
- Lap power
- Last lap power
- Average power
- Altitude
- Estimated time of arrival (ETA)
- Deviation in time from a set finish time
There are power alerts possible, visual, audible and by vibrations, for a preconfigured zone, which can be switched off and on during a race/training. Also the background color and the backlight can be forced, regardless of system settings.

Advanced metrics are only available for the FR2555(s), FR745, FR945(LTE), FR955 Fenix 5x, D2 Charlie/Delta, Descent, Fenix 5 plus, Fenix 6 pro, Fenix 7 and Marq series, like:
- Power workouts created with Finalsurge, Training Peaks, Sporttracks.mobi, including power alerts per workout step
- Power target and metrics can be adjusted based on temperature (also Tempe!), humidity and altitude.
- Lap efficiency index 
- Last lap efficiency index
- Average efficiency index
- Lap efficiency factor
- Last lap efficiency factor
- Average efficiency factor
- Current efficiency Index
- Current power to heartrate ratio 
- Lap power to heartrate ratio
- Last lap power to heartrate ratio 
- HR-zone and Tempe temperature (also for FR245m and FR645m)
- Powerzone 
- Power metrics in % of FTP
- Pace averaged over a custom period up to 300 seconds (5 minutes)
- Power averaged over a custom period up to 300 seconds (5 minutes)
Colored labels are supported only for the FR2555(s), FR745, FR945(LTE), FR955 Fenix 5x, D2 Charlie/Delta, Descent, Fenix 5 plus, Fenix 6 pro, Fenix 7 and Marq series/D2 Charlie watches with 128 kB available for datafields.

Code is available at https://www.vermail.nl/datarun_code/?C=N;O=A and may be used in anyway you like!