SJ, you're right about Florida and it is a complex issue that needs to be fully considered, and studied carefully, etc. Probably not too complex to do a carbon or Co2 calculation based on a mile driven in an LSV vs. a typical SUV, and then back out the 30% of Florida electricity that is coal fired (FLORIDA IS AWFUL in this regard, damn near leads the nation). Place your bets. My bet is that the Co2 and Carbon footprint is damn incredibly (3x) better with an LSV vs. an average vehicle in Walton County, controlling for the carbon output of the average KW of Florida electricity. Harder to control for is the issue of having a 2nd LSV, essentially for fun, and eventually to throw away (or recycle?), and that's what makes me almost neutral on the whole issue - but not quite.
In practical terms, you're absolutely right that what we all REALLY need are basically 100 Horsepower vehicles, give or take 20%. Not 270 horsepower Accords, supplemented by a coal fired LSV.
If I come across any evidence or studies of the carbon output per passenger mile of an LSV, vs. average normally aspirated cars/truck/suvs, I'll share with the group. Likewise if anyone sees that, please share with me, I'd like to learn rather than guess.