You only need a 20 amp 240 volt circuit to Level 2 charge a Spark. The Spark's 3.3kW charger will only draw about 14 amps at 240 volts. At that amperage #12 wire is good for about 100 feet (one way) and #10 is good for about 160 feet. So you don't need very big wire. If you want the charger to...
I am thinking about installing a pair of quality 4" two-way speakers in the front (the factory grilles on the dash just pop off), and a small removable sub enclosure in the trunk. I will need to tap into the rear speakers for the signal and run a 12 volt source to the sub amp. Kind of primitive...
I answered your post on GM-Volt as well. We have had our Spark for about four weeks now. I agree with most of your observations except the one on the brakes. Could be because the spark is replacing my Volt so I am used to the regenerative braking, but it seems fine to me. It's all good for me...