But still very optimistic
With that "one bar" method you can realistically archive about a 40-45km/h average.
(Depends on how much hills you climb an how many traffic lights you encounter there )
That post is from 2013. Most of the Twizy still got the 2,2kW charger then.
Since these things unfortunately weren´t build to last, most of them are now switched with new ones I´ll guess
So, to charge 7kWh( my usual avarage on tour for a 100km drive) you need at least 3-3,5 hours to charge.
(Not necessarily at once)
Combined with that 40-45km/h average puts you near 35km/h ( 22miles/h ) avarage over all.
In reality this easily drops down to 25-30km/h since you lose time plugging in/unpluging, missing the 95% SoC mark and loosing charging effency, high battery/charger temperatures and subsequent power scaling of the charging current.
A standard 180km tour from Berlin to Leipzig takes us around 6-7.5 hours in the summer.
One tour the force (Berlin -> Goslar 330km) took us 14 hours.
BTW: OVMS and Powerbox are mostly useless on those tours, tuning wise.
You do not change the power consumption with tuning of the motor when you drive it at low power.
The only thing that helps a little bit is shaping the recu powermaps and setting the sevcon to 100Nm.
But since there is nearly no breaking on these runs, instead of getting 21% or so like you get in the city, you only get around 2-3 % back.
Thats hardly noticeable.