Are those values from CaniOn?
I've calculated my range per hour based on 3.875 miles/kWh (62 mile EPA range divided by 16 kWh battery capacity) from the wall and the power draw in watts. For example, the stock cord pulls roughly 900 watts, so that would be 3.5 miles of range per hour (3.875 times power draw in kW, 3.875 * .900). At 12 amps, the power draw is 1,380 watts (the i-MiEV pulls .5 amps less than the rated amperage, so 11.5 amps X 120 volts = 1,380 watts). To get kW, divide Watts by 1,000. So, at 8 amps, power draw is .9 kW, and 12 amps is 1.38 kW. Taking 3.875 X 1.38 = 5.34 miles of range per hour. Given that each bar of charge averages 4 miles, 8 amp charging is slightly less than 1 bar per hour, while 12 amp charging is slightly faster than 1 bar per hour.
The flaw with this is that lower power draw is artificially high in the range per hour ratings because of fixed overhead losses when charging (of the total power going in, a larger percent is lost in overhead at lower charge rates. At a 6 amp rate at 120 volts, the i-MiEV may take well over 30 hours to fully recharge because charging losses can consume more than 50% of the incoming power. This is why despite the relatively small difference in miles of range per hour calculations actually yields a considerable time savings between 8 amp and 12 amp charging. If 100% of the power went into the battery, a full, 8 amp charge would only take 17 hours, not 22, and a 12 amp charge could be done in less than 12 hours vs. 14 hours.
Veimi, hope this explains what rkarl meant with charging at certain mph. Don't think of it as speed, but how fast the car accumulates miles on the RR gauge when charging.
Rkarl, that EVSEUpgrade will definitely make level 1 charging must faster. When I first got mine back, I set it to charge at 10 amps, and the car was done well before I thought it would be and when it would've been on 8 amps. Then you get the awesome feeling of 240 volt charging. That is why the EVSEUpgraded cord remains my sole means of home charging (for backup, I do also have a stock 8 amp cord that came with Koorz and an Eaton Pow-R-Station I got for free that is currently only used at events).