So, I think it may have been how I stopped the fast charging. Using the truck to set the charging max and therefore stopping the charge rather than abruptly stopping the charger via the charging kiosk seems to may have been the difference.
Small sample size - but return trip home I was...
Thanks for all of the responses.
The 1.4 was for the entire drive of 2 hours and 20 minutes after the first charge. Conditions were the same before and after. Long drive from Minneapolis to south of Kansas City. Charged 2 more times and was back to around 2 mi/kWh after both of those. Closer to...
A few times now I will get horrendous range (1.4 mi/kWh) after charging. Prior to the charge I get around 2 mi/kWh.
Any ideas? The truck said charging to 90% but I stopped it at 80% - could that be it?!
Makes for hard trip planning.