time to charge

So I've been wondering - if it takes longer to charge the last 20% of the battery's capacity, is it also using more electricity to charge that 80-100% than to charge from say 40-60%? Meaning, is it less efficient, as well as slower? Seems it would be, but I only see it mentioned as a time issue...

Renault website says "Home Wallbox 7,4kW (32A) Included" and keeps referring to 7.4kW. Chargemaster site says it's a 7kW (30A) charger they provide. I have a feeling the 7.4kW measurement comes from back in the day of the British Gas home charger deal (and I believe Rolec have a 7.4kW / 32A...

Observation on the time to charge display (on a 6.6kW equipped Leaf), when adjusting charge rate on a Mainpine-equipped EVSE. If the advertised current is > 16A, it will display the 6kW estimated time to charge. If the advertised current is <= 16A, it will display the 3kW estimated time to...