Glad you found it helpful. It was to satiate for my curiosity, but I figure others would find it interesting, maybe even motivating to try. 
Tesla only charges at peak power for short time. Average power to 80% is much lower, especially for smaller battery cars. It could be as low as 60 kW or 70 kW. Given that SparkEV is more efficient than Tesla, actual number of miles added per unit time may not be very different, maybe only about 20% for smaller battery Tesla.
When (if?) you're doing 250 miles test, make sure to include initial full charge. Then you may need to run bit quicker than 6 hours.
Bolt will still be 50 kW charging, so what Bolt will be saving will be 10 minutes per charge session (5 min to get off road and find charger and 5 min to get back on). For about 20 DCFC sessions needed for SparkEV, that's 200 minutes. For about 5 DCFC sessions for Bolt, that's 50 minutes. Bolt will only be about 150 minutes quicker to 1000 miles than SparkEV (about 2.5 hours). Of course, this assumes Bolt efficiency will be comparable to SparkEV, which should be the case since highway MPGe are similar.
You talk about Tesla with adopter ruining things, but even if one EV cause you to wait, it will mess things up. Now if you had to wait for s.l.o.w. charging Leaf on every DCFC and almost all of them are locals getting free charge, you'd be singing a different tune. SparkEV at 80% would be done (100%) in under 10 minutes; Leaf at 80% would take close to an hour. Now if this happened to you every single time (which is the case with me these days), it's not a mere annoyance, but a questioning of the future of EV.
