I tried a little experiment and charged the last two times with my 120V UMC and to my surprise the my ideal miles were up a little from 179 miles to 183. So does anyone know is it better for the batteries to charge them slow? Or is is just a quirk of the software that shows slightly higher numbers after slow charging? Even before the little experiment I have been very pleased to see my ideal miles slowly increase over the past 6 months. I purchased the car used, and have kept a close eye on the battery. Normally I charge at 240V and 30 amp. I now have about 7000 miles on the car. I also plotted my standard miles and as you can see that number is highly variable depending upon how I have driven the day before.