Have you looked into the Illinois tax credit for electric vehicles? With up to 4000 locally, 7500 federally and 5000 cash incentives from GM it brings the total down to a reasonable amount (but yeah the up front sales tax will be double or triple what a sonic would be).
It's $4000 from GM, $4000 from state, and $7500 from Feds. Yeah, I definitely considered it. But I just don't want to finance $35,000+ and then sit around and wait 8 months to get that $11500 back. It's still a $25,000 car at that point which is still $10,000 more than what I'm looking at. At the time I finally broke even on the gas savings between the two I'd be looking at a several thousand dollar battery pack replacement.